[teheelmao1]

I have the metal triggerbox and it's holding up against 550 fps like a champ, but I wouldnt get that $50 cylinder kit, I had it and the piston was kind of crappy, now the spring is sucking, just spend the money on laylax cylinder parts, its worth it, airsoftextreme.com has good prices on all the parts you would need, oh and that $50 kit made my push FORWARD on the bolt hell because the pistons O ring would constantly bind up, now I can push my bolt forward with 1 finger because of the laylax parts.