FPS Loss > Inactivity?

[Gaffa]

Hi guys, got a little bit of an issue here.

Bought an M14 from a good member on here a while back, anyway long story short it had a Guarder FTK in it, chronoing at 420 or so (not done by me but by the seller) or so I was told it was shooting 420.

Now, I've just chronoed it at 340fps using 0.20's...

Before you ask - the spring was not left compressed, I'm not one to do that.

It has been kept indoors for about 1 month without getting use; the only thing that stands out to me is "airseal" - but I can't see how this could have been effected with 1 months of doing sod all?

[screwdriver]

Re: FPS Loss > Inactivity?

i would very much dought it has ,did you put say 50 rounds through it before you chronoed just in case the oring was a bit gummed up on the piston head ??? otherwise i can see no legitimate reason for a power drop like that after 1 month of no use, though you are only taking someones word for it .
did they chrono or guess as alot of people do based on upgrades

[guard-sniper87]

Re: FPS Loss > Inactivity?

before you chrono mate you need to lube all the rubber seal components up, as they will dry up after a month

[Abbadon101]

Re: FPS Loss > Inactivity?

There is also the chance that it never shot at 420. I have bought alot of guns second hand that were advertised at one FPS and chronoed and another very different FPS.

[Gaffa]

Re: FPS Loss > Inactivity?

Ahh fair enough, thanks for this. And yes, confirmed to chrono at 420 originally (and even I had thought the shots were going far faster than my other rifles - this was as soon as I received it).

I haven't put 50 rounds through it when I chronoed it just before, no.

Hehe oooh no. Even a techie like myself doesn't touch M14's. They scare me inside. Too much going on.

Edit - it was a Guarder FTK and I'm almost sure they include their SP120 spring in there which should produce around 400fps, but knowing Guarder that could have been 450. I didn't do these upgrades though.

[Gaffa]

Re: FPS Loss > Inactivity?

Guys - quick one.

Do you think that by me firing around 50 or so shots (dry fire) would sort out the issue?

[screwdriver]

Re: FPS Loss > Inactivity?

i would rather not dry fire but as long as you can get enough presuure at the head of the piston to enlarge the oring to improve the seal try it

[Gaffa]

Re: FPS Loss > Inactivity?

Okay thanks. Operation had seemed normal; I hadn't noticed any lag in piston movement due to a dead o-ring or whatnot. I'll give it a good run tomorrow.

[Gaffa]

Re: FPS Loss > Inactivity?

A friend has just informed me a G36 he had went from 350 to 280 - but a barrel clean did the job to bring it back up. Haven't heard of that much FPS loss due to the barrel though.

So I'll be packing a cleaning rod in tomorrow.

[richardy]

Re: FPS Loss > Inactivity?

nope a 420 gun aint going to drop to 350. Now if you said it was a kart m14 i might believe you but not a tm , not in a million years..

we arnt talking a weak m100, this is an m120 or 130. Producing 350 .. hmm nope..