Z-Parts CNC 6061 Aluminum Forged M4 Receiver Set for Systema M4 PTW Airsoft Gun

Z-Parts CNC 6061 Aluminum Forged M4 Receiver Set for Systema M4 PTW Airsoft Gun Forged/ CNC 6061 Aluminum Construction (MIL-STD Hard coat anodizing treatment) 20mm Picatinny on Top Suitable Systema M4 PTW Series Rifle Airsoft Guns (For Systema M4 PTW (2008 onwards) & 10th Anniversary Version)