G&P WA M4 GBB Negative Pressure Roller Bolt Carrier (Chromic Coating, Set A) reinforce push pin Gusseted crotch

Gusseted crotch

Semi / Fully Automatic shooting mode

visible ejection port will always help

Key MOD Grip Panel (LONG) Type B  CNC Machined G10 Fiberglass Construction  Made Specifically for the Keymod system handguard  Ultra Slim and from an good handle feeling

G&P WA M4 GBB Negative Pressure Roller Bolt Carrier (Chromic Coating, Set A) reinforce push pin Gusseted crotchG&P WA M4 GBB Negative Pressure Roller Bolt Carrier (Chromic Coating, Set A) Inside (PA) Outside (Chromic Coating) For WA G&P M4A1 Series Come With 2x Polymer Nozzle Set ( Negative pressure operated blowback system ) Design For Replace The Original Bolt Carrier SKU GP WP205A Item Weight (gram) 203 Major Color Silver Built Material Inside (PA) Outside (Chromic Coating) Manufacturer G&P Disclaimer NOTES: Self Installation & Modification (e. g. Sanding)