G&P GBB Steel Bolt Stop Set for WA M4A1 Series / G&P WA M4A1 Series Metal Body

G&P GBB Steel Bolt Stop Set for WA M4A1 Series / G&P WA M4A1 Series Metal Body Steel Construction Design For Replace the Original Parts Suitable For WA M4A1 Series/ G&P WA M4A1 Series Airsoft Gas Blow Back GBB Rifle