G&P MWS Stainless Steel Bolt Stop Upgrade Kit for Marui M4A1 MWS GBB Rifle

G&P MWS Stainless Steel Bolt Stop Upgrade Kit for Marui M4A1 MWS GBB Rifle Stainless Steel Construction ONLY For Marui M4A1 MWS GBB & Marui MWS CNC Custom Adjustable Trigger Box (MWS021B)