Rocket Airsoft G36 Plastic Hopup Chamber Set Gears and Related Parts if your stock motor is

if your stock motor is getting old or generating too much heat

The bullet window with the fake 556 rounds isn't just for show

Allows for use with suppressors

Overall a great vest system with laser cut MOLLE straps

you will need the 90 degree piston instead of this one

Rocket Airsoft G36 Plastic Hopup Chamber Set Gears and Related Parts if your stock motor isRocket Airsoft G36 Plastic Hopup Airsoft Full Chamber Set. Made of polymer and other materials. Comes with basic parts for the hop up chamber without the bucking. (please note: packaging may be generic or labeled as 'Rocket Airsoft', but is made by SHS OEM). DOES NOT include Bucking