SKU 5165449845 Brand Palmetto State Armory Model Number 5165449845 UPC 5165449845 DETAILS Manufacturer: Palmetto State Armory Product Line: PA-9 Includes: 9mm BCG Material: 8620 Steel Compatibility: AR-9 Finish: Nitride FEATURES PSA Gen 4 Hybrid 9mm BCG. Nitride treated 8620 steel bolt, with an enhanced firing pin and external 5.56 style extractor. The bolt carrier group is compatible with most aftermarket fire control groups. UPC#: 005165449845