G&P Blank MWS Forged Aluminum M4 Receiver Set w/ Hop-Up Chamber for Marui M4A1 MWS GBB Net-Weight-(g)_749 4 Variable Magnification Levels of

4 Variable Magnification Levels of Zooming

New 2011 version features enhanced more-aggressive closer

Suitable For Umarex H&K MK23 SOCOM Series Gas Blow Back GBB Pistol

This bolt can accept any APS 13 mm springs

Low Profile And Light Weight

G&P Blank MWS Forged Aluminum M4 Receiver Set w/ Hop-Up Chamber for Marui M4A1 MWS GBB Net-Weight-(g)_749 4 Variable Magnification Levels ofG&P Blank MWS Forged Aluminum M4 Receiver Set w Hop Up Chamber for Marui M4A1 MWS GBB Aluminum Construction CNC Quick Release Hop Up Chamber (Patented) CNC M4 Receiver Assemble Pin Set (Black) (MWS) Suitable For Tokyo Marui M4A1 MWS Series Airsoft Gas Blow Back GBB Rifle