I have owned this piston for about a year now and i just have to say that it is Outstanding!! Made of that azimuth plastic that is REDICULIOUSLY strong, and combined with the heat treated full metal tooth rack( which btw is made Extremely well, they made sure the teeth meshed up perfectly with the sector gear, and it is NOT a brittle metal either) it has prOven to be an amazing part of my gearbox, which just sounds amazing with this piston on it. Like Lierally, it even SOUNDS better! Because it fits so well.
I run it with an echo1 master series mp5 at 20 rps and it is just Flawless.
BUY THIS PISTON! Action army Actually fulfills your dreams as an airsofter by actually making a product that PERFORMS
-Full metal DURABLE tooth rack
-perfEct fit inside gearbox. (a lot of times, the teeth will be too short or brittle -wih other manufacturers- but action army has perfected the art of designing a piston that fits PERFECTLay)