G&P WA M4 GBB Negative Pressure Roller Bolt Carrier Grey (Set B)

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G&P WA M4 GBB Negative Pressure Roller Bolt Carrier (Set B) Inside (PA) / Outside (Gold Chromic Coating) For Bomber GBB CNC Metal Body ONLY Come With 2x Polymer Nozzle Set ( Negati ve pressure operated blowback system ) Design For Replace The Original Bolt Carrier SKU GP-WP204B Item Weight (gram) 205 Major Color Grey Built Material Inside (PA) / Outside (Gold Chromic Coating) Manufacturer G&P Disclaimer NOTES: Self-Installation & Modification (e.g. Sanding) is required. Please consult your local gunsmith / expertise for installation advise Show more