RA Tech Magnetic Locking NPAS Aluminum Complete Bolt Carrier Set for GHK M4 GBB

RA Tech Magnetic Locking NPAS Aluminum Complete Bolt Carrier Set for GHK M4 GBB Aluminum Construction A NPAS for tuning FPS levels for your Rifle This unit also features a universal tool for precise adjustments Suitable For GHK M4 Series Airsoft Gas Blow Back GBB Rifle Airsoft Guns