Thread: TM M4A1 BOYS
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Old August 29th, 2006, 15:54   #30
jackel
 
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Join Date: Aug 2005
Location: Nova Scotia
I also upgraded the one that I had owned by adding a small spacer behind the main piston spring give it a noticable fps increase. Keep in mind doing so will drasticly limit the life of the gun and should only be preformed by somebody who is familiar with the internals. :cheers:
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