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No change in fps?
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zehave
Corporal
Join Date:
Sep 2016
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168
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#1
No change in fps?
10 December, 2016, 00:15
hi all
i finally bit down and bought a madbull tightbore 6.03mm for my tm hk417. went in to my local gunsmith to get it fitted but it seems my fps didn't change at all?? is that suppose to be right??
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colinjallen
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Oct 2012
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#2
10 December, 2016, 07:55
Re: No change in fps?
Is the new barrel the same length as the old one? What was the bore diameter of the old one?
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zehave
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Sep 2016
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#3
10 December, 2016, 09:40
No change in fps?
same length.. 300mm i think.. and went from 6.08 (stock for tm i think again ) to a madbull one at 6.03mm
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Armourpiercing
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Mar 2009
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#4
10 December, 2016, 13:37
Re: No change in fps?
Tight barrels are for better grouping, a by product of fitting them can be:
Range +/-
Power +/-
Jams +/-
Another factor can be the hop rubber used when it's swapped out (A TM cannot be beat realistically).
Fitting one does not always automatically give better power, range etc...
AP.
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PelletWarrior
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Oct 2016
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#5
10 December, 2016, 13:46
Re: No change in fps?
If your gunsmith did it, and not you. He could have drilled a small hole in the cylinder to keep the FPS roughly the same?
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Armourpiercing
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Mar 2009
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#6
10 December, 2016, 13:51
Re: No change in fps?
That seems very unlikely. :-)
AP.
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zehave
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Sep 2016
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#7
11 December, 2016, 01:07
Re: No change in fps?
don't think my gun smith drilled any holes.. the only other thing he did was loosen the 2 knobs on the rail so i can fit a short vfc rail.. really strange.. was hoping to up the fps a little at least with the tight bore... guess the next step is the spring?
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seansamurai1
General
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Oct 2009
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#8
11 December, 2016, 20:15
Re: No change in fps?
Its probably more down to the standard TM cylinder seals were designed to be at just shy of 1 joule, a tightbore wont really change it much.
section 24 of the 1968 Act
Supplying imitation firearms to minors
1)It is an offence for a person under the age of eighteen to purchase an imitation firearm
2)It is an offence to sell an imitation firearm to a person under the age of eighteen.
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