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Old October 17th, 2011, 19:34   #8
KBarlow
attention whore wants a custom title.
 
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Join Date: Jan 2011
Location: Kamloops, BC
By how much are you trying to reduce the FPS?

A shorter inner barrel will reduce the velocity by a bit.

http://www.hrabri.org/barrel-length-effect-on-fps

The first and third gun in that article are almost identical, however the first gun's barrel is 132mm shorter than the third gun's barrel, and the first gun shoots 97fps lower than the first gun.
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