Results 1 to 33 of 33

Thread: [Dev] In-grip/pouch electric warmers for gas guns

  1. #1
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default

    Hey all, looking for a few opinions from everyone!

    I’m a UK based airsfoter and currently have 3 gas guns, one of which is a classic Maruzen Micro Uzi (the one with the recessed mags), as well as strongly considering getting my hands on a GBBR. As many of you know gas systems and cold do not combine too well, so the obvious solution is to add a small heating element to the mix. So the obvious solution is to add small heaters into the two places that the mags reside in, the pouches and the grips.

    Problem with just adding a heating element and a battery however is the fact that A) battery life would be terrible and B) the common heater the right size heats to up 40deg at 5v. This isn’t ambient temperature as well, but direct application, meaning that the magazines run a risk of over-pressurizing and blowing or sending the fps sky high for the first shot.

    So I found myself in a situation where I was in a pub, having lunch with a bunch of environmental science students who were discussing the more exiting species of lichen, which led to this:



    What you see there is a very basic temperature control system. At the top you can see a heater and thermistor. In the middle you have a voltage comparator and a simple voltage divider circuit, with one end having the thermistor and the other will have the appropriate resistor, which sets the default cut-off point for the heater. At the bottom you have a 3.7v battery, ideally a li-on one, taken from a mobile phone, as they come with protection circuits built in, meaning that charging them is a piece of cake and I don’t need to worry about the usual lipo troubles with charging and discharging. Also, as it’s only 3.7v, it should drop the heater voltage to a max of about 25-30deg, which is a little bit safer than 40 I guess. I am not 100% sure as to what a safe heat is however.



    That’s a more sensible version of the above image, with a charging point. What I am struggling with at the moment is being able to understand how the thermistors actually work. Ideally I’m after a device with a linear or roughly linear relationship of heat to resistance, meaning that I can get the heater to a certain heat measure the resistance of the thermistor and find a resistor of that value. That way I can manually calibrate the cut-off points for each device.

    Also, the other part I am not 100% on is the comparator switch. I know that they are cheap, and usually come with two in one package and compare voltage. But how they work or which one to pick is also a tricky one. I can dig out my op-amp lecture notes, but I think it will be cheaper to buy a prebuilt comparator. Hell, this may not even be the best way to do this, so any input would be much appreciated. All I know I need is something that completes a circuit is one voltage is higher than the other one and runs on as little as 3.7v and if it has some sort of delay built in that would be even better.

    Oh, and for reference on costing and sourcing parts etc, these shops don't sell airsoft bits, are all within forum policy.

    Heaters
    Available in USB heated gloves, pretty much any China-crap store, such as ebay, bestofferbuy.com etc from ~£4 and come in pairs, sometimes even 4 in a set. They also come with nice small bullet connectors and a USB cable that you can use to make the charger.

    Thermistors
    Are the NTC types and are available on ebay

    Comparator
    No clue, all I know, is I need this, a Dedicated voltage comparator chip

    Anyway, hope this helps someone or someone has any advice to help me, even if it’s something mind-numbingly simple, haha

    Apologies, please merge with bottom of post:

    Just saw this website: http://www.brighthub.com/engineering...les/60941.aspx
    Looks perfect for me, available on the bay for 2.20 for 6, I'm sure RS etc would have it for cheaper. Was getting confused by some of the other models which had clock in pins and all sorts -_- Seems to have a voltage range of 2-36V. I may end up needing a quad however so that I can use one to disconnect the heater circuit from the charge loop... Or should I not bother to allow for external batteries etc? bleh, decisions...
    Last edited by Rampage; 11th April, 2011 at 13:58. Reason: Op Request

  2. #2
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Judging by the lack of screams of "you crazy, homes" or "You noob, that's not how electronics work", I can only assume I must either be doing something right or building something very boring :P

    I have ran into a bit of a dead end however, to do with the charging system. Am I right in assuming that the mobile phone li-on/li-po protection circuit is a magical force field that will allow people to pump in USB-ish voltages (4v-6v) and enable it to safely charge up to the usual 4.2v? In addition I can only guess that it prevents the cell from falling below 2.whatever volts and manages the trickle charging up to that point? At least that is my understanding of over/under voltage protection.

    I spent most of last night browsing data sheets of various charging chips and have managed find this little beauty, a 5 pin li-on/li-po charge manager which is a reasonable size for a surface mount (through hole charge managers don't seem to exist, grr) and only needs a few 1uF decoupling caps to make it work.

    Question is however, do I need it? My googling only brings up info on unprotected batteries, but nothing on what the basic standards for the protection circuits actually are and if I can rely on them to protect the battery from destroying itself while the heater is on or during the charge.

    Anyway, in an attempt to answer this, under close supervision, I've directly wired the battery to my USB port, out of interest if anything. It may explode, may not even do anything, I dunno. If I learned anything last night, it is that this should technically work.

    We shall see how it goes I guess..

  3. #3
    Join Date
    Sep 2010
    Location
    East London
    Posts
    924

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    I just put mine on a hot water bottle before a game lol. Fair play to you though!

    WARNING. Post may contain traces of sarcasm. If you do not understand this, I pity your existence.

  4. #4
    Join Date
    Jul 2010
    Location
    Midlands
    Posts
    5,232

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Great idea.

    Something slick and very portable that say, slips into the pocket of a mag pouch would be the solution though:

    (for example having a sleeve or something that the mag easily slips into thats powered by a bettery in an adjoining mag slot perhaps)

  5. #5
    Join Date
    Sep 2010
    Location
    Northants
    Posts
    229

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    yup, id buy one! cold mags bug the living daylight outta me!!
    Dog Soldiers Airsoft - We hope we give you the shits.

  6. #6
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Yeah, the pouch warmers are a lot more simple to make due to the fact that you can afford to use A larger variety of battery solutions, AA even, as like you said, you can just stick it into a dummy mag pouch and be done with it.

    Ideal solution though would be a flat lipo and the control circuit in a waterproof bag within the fabric on the back of the pouch, with a charging port tucked away somewhere, suitably protected from getting wet. No fake pouches, no extra room taken up and all the benefits, can't be bad, eh?

    I've not really been focusing on these too much yet though, as I know that a mag can stay as warm as it likes while in storage, it's in the pistol, where it tends to lose temperature for me. Every time I forget to switch a mag out of my pistol for a warm one for a while, it comes out ice cold, whether it's even been fired or not -_-

    So I'm soldiering on with the grip design for now, which I will be able to make a straight conversion over to pouches or the stand-alone mag wraps which you mentioned, Fitch afterwards. All this fuss with charging etc is really a nice-to-have, as I don't like half-finished designs. I could cop out and just use single-use cells or use a phone cradle charger to do the job, but I just think it's such a bodge...

    As soon as it's all done, I'll make detailed guides on how to make one or if people really want them I could build a few sets and see how it goes, but whatever. I'm know I'm not the first to make something like this, probably won't be the last. It's about time someone documented it though.

  7. #7
    Join Date
    Dec 2009
    Location
    Croydon
    Posts
    2,863

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Cold mags are most definately a pain in the backside, and this is a potentially very good idea. Whether it would take off or not I dont know, personally I just use one of those reuseable handwarmers from a camping shop. Pop one of those behind my pistol mag pouch and jobs a good 'un, so far my mags have neither exploded or reached a billion FPS and shot the moon down

  8. #8
    Join Date
    Feb 2011
    Posts
    546

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    yea I keep hand warmers with my pistol mags as well, but unfortunately it does mean that the one in the gun will get cold after you've reloaded...

    i had this outrageously stupid idea once and drew up a sketch where essentially after every shot, a tube (external at this point) would guides some of the gas back to the grip panel (1911) into a heat sink, and the gas would be ignited by a spark generated from the moving slide by friction similar to a lighter's flint... so not only you get a nice warm magazine, bit of cool visual explosion, a potentially melted bb, and best of all, a burnt face if the whole thing blows up... but hey, i hvn't felt suicidal enough to build this just yet.

  9. #9
    Join Date
    Feb 2010
    Location
    London
    Posts
    1,606

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Quote Originally Posted by blobface View Post
    yea I keep hand warmers with my pistol mags as well, but unfortunately it does mean that the one in the gun will get cold after you've reloaded...

    i had this outrageously stupid idea once and drew up a sketch where essentially after every shot, a tube (external at this point) would guides some of the gas back to the grip panel (1911) into a heat sink, and the gas would be ignited by a spark generated from the moving slide by friction similar to a lighter's flint... so not only you get a nice warm magazine, bit of cool visual explosion, a potentially melted bb, and best of all, a burnt face if the whole thing blows up... but hey, i hvn't felt suicidal enough to build this just yet.
    Maybe leave that idea alone
    Others till I die

  10. #10
    Join Date
    Apr 2011
    Posts
    2

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    As you said, the cheapest (by far) heaters that are available are from usb mug heaters. From a little searching on ebay, they are ~2.5W @5V.
    P=VI, therefore this gives a current of ~500mA. Comparators give a max current output of ~30mA. So you would need some kind of amplifier/buffer thing. Also you have got to be careful with the inductance of the heater, when turning on and off. This will cause an emf spike and possibly break the components (Same if you have a mosfet in your trigger assembly).
    I therefore propose a mosfet (because they are ‘cool’, pardon the pun) to act as a switch to turn the heater on and off. This will only work if the heater and the thermistor are in very close proximity, that or you can use hunting to make it work, but that means more circuitry.
    This diagram should make sense:

    The values are not all calculable without the voltage of the batteries being used, but it’s not too difficult to change them
    The 10ohm resistor and the 10mH inductor is the heater. There are two diodes to stop the mosfet blowing up and the 10k pot is to vary the temp you want to heat up to.
    Sorry if this makes no sense, it’s been a long day.
    I cannot try this theory out till I get back from uni on the 25th but will keep you updated when I try this out.

  11. #11
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Hi Pau1,

    Very cool, your circuit makes perfect sense and cheers for the heads up on the comparators. I will be using an LM393, though, after reading the datasheet again (and again and again, haha) I was not able to spot where the max current this thing can kick out was? Could you let me know which bit I should be looking at?

    Also, there is a cheaper alternative to usb heaters though, at least if you are making more than one set of these: Resistance wire! fantastic stuff, and there is a very good website teaching you how to use it here

    However I fear you may very soon fall into the same development hole I have done, that is if you are also trying to fit the system entirely within a pair of grips. The space constraints mean that there really is no alternative, other than using lipos. And in order to use those, you need to use a decent charger chip and then build a custom under-voltage protection circuit on top of that.

    Let me post up a recent post I made on Arnies and Airsoft Mechanics on the subject:

    Hi everyone

    Quick update on design progress and a big (for me) question actually.

    I have decided to use a cheap unprotected lipo, as those 'protected' lipos only protect the thing from blowing up, not from being damaged.

    The charging part is easy, I can just used that 5 pin charging chip I mentioned earlier. It's surface mount, but not ridiculously small, so I should be able to handle it, just tore the circuit for that out of the datasheet.

    The under-voltage protection is another story however... That has been a royal pain in the ass and I have found literally one example of how to build one.

    http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=8492 (last pic on there, posted by AudioGuru)

    It looks ok, but the hysteresis part looks dodgy to me, does it need a diode in there as well as that resistor? If so, which way is the current even meant to be flowing there? Also, what should the resistor value be, if R1 = 470k and R2 = 33k? as those two pair up to make a steady 0.2v at 3.048V or something like that, thus triggering the cut-out then. So lets you use most of the battery's voltage without exploding.

    Also, is there a better or cheaper way to do this? The LM10 is quite expensive (comparatively speaking) I searched all over the place, but no luck.

    Only thing I found (well, stumbled across only today actually) is an adjustable voltage regulator, the LM317L what do you reckon, usable? Better alternative?

    Anyway, here's my most up to date circuit, would really appreciate any help you can offer!



    Datasheets:

    MCP73881: http://www.datasheetarchive.com/pdf-...SA-357692.html

    LM10: http://www.datasheetcatalog.org/data...r/DS005652.PDF

    P.S. as you can gather, I am not an EE, just someone who'se dabbled in it a little bit. So stupid, glaring errors are there by accident, please do pick me up on them!
    Btw, nice first post mate :D Stay in touch
    Last edited by aribos; 20th June, 2011 at 11:28.

  12. #12
    Join Date
    Mar 2011
    Location
    London
    Posts
    1,778

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    So could you mod a holster so that the mag holder was heated ? Guess it would save leaving the spares down my pants and having to grip the handle tight with both hands in an attempt to keep the gun warm on a winters day but what would you do to keep the mag warm in the gun ?

    Even co2 seams to suffer if you start off loading fast on a cold day

    Oh when will I get a decent knights stoner LMG aeg ?

    P mags up for sale http://forums.zeroin.co.uk/showthrea...encer-200mm-m4

  13. #13
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Of course. Ultimately, all the heater is, is a coil of wire. The circuit board I anticipate being no larger than 5mm high at a size of 50x20mm or so, or whatever the hell I decide to keep it at, will need to see once I finalise the details, then you have the battery, which can be anything really. Find a pouch to store all that in (or just whack it all in behind the holster) and you are good to go

    For the mag in the gun, the entire thread is about building heated grips, so those detachable grips would be replaced with ones which contain the battery, circuitry and heating elements. If you are a bit creative about it, I am sure you can get the concept to work in any gas gun.

  14. #14
    Join Date
    Jul 2010
    Location
    Midlands
    Posts
    5,232

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Bloody gas pistols eh!

    Had the other problem today- it was too warm. None of my pistols were able to effectively fire and shift their slides. Just too damn hot.

    I just wish that c02 was more tuneable to get it below site fps thresholds.

  15. #15
    Join Date
    Oct 2008
    Location
    Gillingham, Kent
    Posts
    8,359

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Not sure if it was here or Arnies.

    Some guy was doing this, and nearly blew the bottom of the mag off....!

  16. #16
    Join Date
    Mar 2011
    Location
    London
    Posts
    1,778

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Oh if you want to tune co2 I could offer some advice, if you take apart a kjw flow valve and just do up the screw that go`s into the valve you can limit the amount of gas that is allowed to flow I can now adjust my kp06 mags to give between 300fps and 380fps it does take a bit of messing around.

    Its a shame that I killed one valve to work out how they work and have lost a mag now but I have 2 co2 and 1 green gas now and me and the dremmal may be able to save the broke valve at some point or I may just fit a hi flow and see what happens lol

    Oh when will I get a decent knights stoner LMG aeg ?

    P mags up for sale http://forums.zeroin.co.uk/showthrea...encer-200mm-m4

  17. #17
    Join Date
    Apr 2011
    Posts
    2

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    I used a different data sheet can’t find the one I used, but this one has it http://www.rapidonline.com/netalogue/specs/82-0208.pdf.
    But in any case TTL logic (which is what the LM393 looks like) will only output about 50mA (not up to 0.5A anyway)
    For the lipo protection you can use a comparator, just to save the number of chips you will need (you can get 2 comparators in one chip). Something like this will work, where

    This will not cut off the power, just beep when its low (or you could have a light or something). And you will have to change the resistors and/or the zener diode if you want to use different batteries.
    Some quick calculations, if you want to use the battery for a length of about 5 hours (so you can change battery half way through the day) at 2.5W with a 7.4 lipo you will need a battery of ~1736.11 mAh. Something or this size:
    http://cgi.ebay.co.uk/Turnigy-1700mA...item1c1cbd6d07
    Although the heater wouldn't be on all the time...
    ... we need a physicist to help!

  18. #18
    Join Date
    Mar 2011
    Location
    London
    Posts
    1,778

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    why not rig it up to a thermal switch then you can run it at any voltage you want ?

    Oh and dude your probably going to get into trouble for posting a link to another retailer aka ebay

    Oh when will I get a decent knights stoner LMG aeg ?

    P mags up for sale http://forums.zeroin.co.uk/showthrea...encer-200mm-m4

  19. #19
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Pau1, I KNEW I didn't need to use that bloody LM10, those things cost a bomb! I like that method a lot, it's so simple! Will look into the %error and other numbers on everything tomorrow.

    And Jag, really, your warning is very much heeded. I will keep the cut-out temperature nice and low, about 25-30 most likely. It's why I am basically building a thermostat around this thing. I will see what results I get and test this thing HEAVILY before I give the ok on the plans for others to try.

    And how do you mean thermal switch? If that is what I think it is, that was basically what that original ketchup circuit was. It's a DIY Thermal cut-out, using a few resistors, a thermistor and a comparator

  20. #20
    Join Date
    Mar 2011
    Location
    London
    Posts
    1,778

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    my lizard used to have a little probe and a dial and I could set what temp his heat mat would go on at and turn off at you must be able to rig up something like that ?

    I just use co2 myself lol

    Oh when will I get a decent knights stoner LMG aeg ?

    P mags up for sale http://forums.zeroin.co.uk/showthrea...encer-200mm-m4

  21. #21
    Join Date
    Jan 2010
    Location
    Ye Olde Thatcham
    Posts
    5,891

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    May seem simple but buy a pair of heated gloves and keep the mags in those? Also this is a great idea <3
    Sorry if this was a bit necropost-y, its a good idea that should be seen and built upon :/
    -TM Recoil M16 Custom- -TM 1911 MEU- -Tanaka SAA- -TM HK45- -JG G36k Ris-
    -ECHO1 SA58 OSW- -A&K Masada- -VFC FNX-45- -TM Recoil AKs-74u-

  22. #22
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Just to let you guys know, this project has not been abandoned, I just have bugger all time to work on it >_< however if anyone wants help with pushing it further, get in touch.

    Jonny, in essence that is exactly what this project is. The problem comes from fitting it along with a power source within a a pistol, as I can keep mags warm in my pockets, no problem. Its within the pistol, where the cool-down really gets going.

    The only rechargeable method for this is via lipo or lion. Lipos come n a larger variety of sizes, so they are the obvious choice. But they need a control circuit to prevent over charge and over discharge. The protected lipos all seem to be crap, so I have been working on building a better solution.

    It was almost there, design-wise, but then I got distracted by other projects AND a new job, so I am slowly working my way through all my little side-projects I have, starting with anything non-hardware based, as that I can devote as much or as little time as I want to a single session.

    I will keep hacking away at this, but if anyone has any experience with setting up voltage cut-outs, give me a shout. That is the one part which I am struggling with atm... Will upload latest designs later today, as I have dumped the LM10 design in favour of the cheaper and simpler zener diode solution, which I am still finalising. I've also adapted the thermostat bit a bit as well, but no major changes there.

  23. #23
    Join Date
    Jan 2011
    Posts
    66

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Very interesting project! Please make it work!!

    I think that ideally you'd need to have warmers both in your mag pouches and on the pistol grips, so you'd always have warm mags.

    Also, would it be an idea to have the battery attached to your belt and the wire running trough a pistol lanyard to the grips? Surely this would save some space problems.

    Keep us updated!

  24. #24
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    haha the final design should cater for both, with a QD charger port at the base of the grips, which should take any power source at about 5-10v or so, will see what I can get to power it. I just don't like relying on the lanyard design, seems messy.

  25. #25
    Join Date
    Mar 2011
    Location
    London
    Posts
    1,778

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    You could use a lanyard cord to run the power to the hand warmers then you could put the battery anywhere in your rig you wanted so it could be pretty big on a 1911 or something the heater pads can just go under the hand grips.

    Oh when will I get a decent knights stoner LMG aeg ?

    P mags up for sale http://forums.zeroin.co.uk/showthrea...encer-200mm-m4

  26. #26
    Join Date
    Jan 2011
    Posts
    66

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Quote Originally Posted by Bachelarius View Post
    haha the final design should cater for both, with a QD charger port at the base of the grips, which should take any power source at about 5-10v or so, will see what I can get to power it. I just don't like relying on the lanyard design, seems messy.
    I'm just wondering how big would the grip have to be to be able to fit a battery on it...

  27. #27
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    My test pistol is a TM Detonics, for reference. Should give several hours of use, if I'm lucky, but no real way to tell yet. Bare in mind you do have both grips for space. Will probably need some sort of method of wire routing between the two, so maybe those ergo grips or via the rear grip pad. Other pistols... no idea how to make it work.

    Glocks are the big unknown for me as they don't have removable grips I think? I know 1911s are fine, m9s are fine, my microUzi should be fine so same for MACs etc. Sig's - not sure... bleh, don't care yet, will do when the time comes.

  28. #28
    Join Date
    Mar 2011
    Location
    London
    Posts
    1,778

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    hi capa`s ? oh wait my kjw takes co2 so will get 320fps in the winter still and my wa is 380 in the summer on propane so should get 300 on propane in the winter I hope.

    Oh when will I get a decent knights stoner LMG aeg ?

    P mags up for sale http://forums.zeroin.co.uk/showthrea...encer-200mm-m4

  29. #29
    Join Date
    Aug 2009
    Location
    Oxfordshire
    Posts
    817

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Hmm... tricky. Don't know, possibly not, unless I find a clever way to do it. Hi-cappas don't have the sort of space in the grips, so may have to be external power only. That is if I can even manage to securely fit the wire in there.. Such an awkwardly shaped magwell/grip...

  30. #30
    Join Date
    Jan 2010
    Location
    kent
    Posts
    2,846

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    I will just get some re useable hand warmers... camping shops sell them... pop it so its hot, leave it in the puch with a mag....

    job done
    FOR SALE
    7" Magpul ERGO free float ris, 7" larue ff ris, fortis shift,
    , multicam pistol pouch, ACM pistol fast bags.

  31. #31
    Join Date
    Aug 2010
    Posts
    254

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Not sure if this has been mentioned but have you considered battery powered flexible silicone heating elements?

    http://www.alibaba.com/product-gs/72...ement.html?s=p

    Looked at the USB powered gloves but they tend to operate at 30C which would involve pesky wiring to bring the temp down. The company making the silicone pads linked above claim to be able to make them to any size for any voltage with the added benefit of a temperature controller with digital display. Not sure how expensive this would all get for a vest with 6-9 mag pouches but with the average unit thickness of 1.5mm This would even make sense on a pistol with a small battery box.

    Very surprised given the technology already available for heated gloves and clothing that a heated tactical vest for gas magazines doesn't already exist.

    It must also be possible to adjust something like this by stripping the electronics out of it and lowering the heat: Very cheap at 14 so will prob buy it just to have a go.

    http://www.maplin.co.uk/padded-elect...m-large-531688

  32. #32
    Join Date
    Jan 2010
    Location
    Ye Olde Thatcham
    Posts
    5,891

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    year and a half necro, but a damn good one. those top ones are looking good.
    edit: you could actually fit them inside the grips of a 1911... maybe to a button cell or two.
    -TM Recoil M16 Custom- -TM 1911 MEU- -Tanaka SAA- -TM HK45- -JG G36k Ris-
    -ECHO1 SA58 OSW- -A&K Masada- -VFC FNX-45- -TM Recoil AKs-74u-

  33. #33
    Join Date
    Apr 2012
    Location
    Back in Blighty!
    Posts
    2,618

    Default Re: [Dev] In-grip/pouch electric warmers for gas guns

    Start trawling ebay.ca (canada)

    The have rechargable battery powered coats as fashion items. My mates wife loves hers!

    Depending on cost, reverse engineer one of those and make your mag pouches the new coat.

    Good luck!

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •