Retro Arms CNC SOPMOD M4 NGRS Gearbox 8mm pre build Our Ultimate Performance Piston is

Our Ultimate Performance Piston is made from a proprietary blend of materials being Polycarbonate as the base

You can find what type of sockets gearbox have on the outside part of the gearbox (8mm or 9mm)

Minimum Safety Distance is 5M -  All Smoke Devices should be handled with care

all will be smooth without the risk of snagging on your environment

buffer tube

Retro Arms CNC SOPMOD M4 NGRS Gearbox 8mm pre build Our Ultimate Performance Piston isRetro Arms CNC gearbox for TM NGRS SOPMOD M4 AEG. When it comes to building a reliable high tier NGRS, this gearbox should be your first item in your build. With the stress of recoil, you need to have the strongest gearbox possible. Precision machined from a block of billet EN AW 7075 T651 aluminum Durable anodized finish Reinforcement in key stress points to counter rapid wear from high performance parts Pre radiused cylinder windows helps evenly