Guarder AEG Tune-Up Spring 120 for PSG-1 Category_SPRING For MARUI M4-A1 Carbine Use

For MARUI M4-A1 Carbine Use Only

Bore-Up Ventilation Piston Head

Oil Quenched & Tempered Si-Cr Alloy Steel Wire Type Spring offer stable performance

Half-Teeth Polycarbonate Piston use only

Guarder AEG Tune-Up Spring 120 for PSG-1 Category_SPRING For MARUI M4-A1 Carbine UseGuarder Airsoft AEG Tune Up Spring Series SP120 (~393 Fps (0. 2g BB)) For Tokyo Marui PSG 1 Series Airsoft Sniper For Tokyo MaruiAirsoft Electric Gun (AEG) Sniper PSG 1 Supreme Quality Airsoft Electric Gun Spring Oil Quenched & Tempered Si Cr Alloy Steel Wire Type Spring offer stable performance Ready to upgrade your Airsoft Sniper to ~390FPS Muzzle Velocity Power Output may vary if used in conjunction with our upgrade parts Material: Oil Quenched