Guarder Bore-Up Polycarbonate Piston Head with Bearing Seals - QD Sling Mounts with

- QD Sling Mounts with 5 mounting points

Unique low-profile waist adjust system

- Power Source: Gas (Green Gas)

5" barrels extends the overall length to 16

So the magazine insertion is in correct position

Guarder Bore-Up Polycarbonate Piston Head with Bearing Seals - QD Sling Mounts withBore Up Series upgrade part Polycarbonate Piston Head with Thrust Bearing is renewed to be more effective Custom 6 holes ventilation design increase the stability during full auto shooting mode It creates soft & quieter shooting sound than the sister part, Aluminum Version Reinforced piston head will provide extra duration during rapid & prolonged firing Recommended to use along with Upgrade Springs As always, upgrading AEG require necessary skill &