Details
G&P WA M4 GBB Negative Pressure Roller Bolt Carrier (Set A)
Inside (PA) / Outside (Die-Cast)
Suitable for WA / G&P M4A1 Series Airsoft Gas Blow back GBB Rifle
Come With 2x Polymer Nozzle Set ( Negative pressure operated blowback system )
Design For Replace The Original Bolt Carrier
NOTES: Self-Installation & Modification (e.g. Sanding) is required. Please consult your local gunsmith / expertise for installation advise.