Quote:
Originally Posted by cjboi
You have a 430mm inner barrel and your only getting 290 FPS? you could try to put an extra rubber band in your piston head, it would help expand those o-rings more and get more compression.
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The piston head needs that extra room to re-compress so it doesn't create "Barrel suck" as it's going backwards.
A trick (Credit goes to Ty) is to take the o-ring, stretch it around the cylinder and heat it up with the HEAT (not flame, HEAT) from a candle or a heat-gun.