get the g&p out of the box you have to down grade to play..a muzzle velocity reducer i dunno about...use it you want IMO down grading sound better
im gettin a g&p m4a1 my self...a fellow memeber got me hooked on it (damn you SINN) he has no problems at all
for a m9 all metal kjw is your best bet...upgrade if you want...im gonna do it to mine...
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