BRG 5.56mm/.223 Complete Bolt Carrier Groups Nitride Black

BRG 5.56mm/.223 Complete Bolt Carrier Groups Nitride Black. Specifications for BRG 5.56mm/.223 Complete Bolt Carrier Groups: Manufacturer: BRG Color: Black Finish: QPQ Nitride Fabric/Material: 8620 Steel Cartridge: 5.56mm .223 Remington Gun Make: AR Platform Gun Model: AR-15 Hand: Right Features of BRG 5.56mm/.223 Complete Bolt Carrier Groups Carrer - 8620 (20NiCrMo2-2) heat treated (case hardened to SAE-AMS-6875) - QPQ nitride finish. Bolt - 14NiCr14 heat treated (case hardened to SAE-AMS-6875) - QPQ nitride finish. Extractors - Aircraft quality alloy steel shot peened. Heat treated to military drawing specification SAE-AMS-6875. Phosphated to 5.3.1.3 of MIL-STD-171. Gas Key - 4130 aircraft quality steel heat treated to SAE-AMS-6875 QPQ HT PROCESS Cam Pins - Precision machined. Heat treated to SAE-AMS-6875. Phosphated to 5.3.1.3 of MIL-STD-171. Firing Pin - Machined and precision ground for accuracy. Heat treated to military drawing specification per SAE-AMS-6875. Chrome lined per 1.2.2 of MIL-STD-171. Firing Pin Retaining Pin - Heat treated stainless steel pin contouring the carrier body. Ejector - Precision machined. Heat treated to SAE-AMS-6875. Phosphated to 5.3.1.3 of MIL-STD-171. Gas Rings - 3 pc. stainless steel per Mil-Spec. Package Contents: BRG 5.56mm/.223 Complete Bolt Carrier Groups BRG BCG556BRG: 5.56mm/.223 Complete Bolt Carrier Groups Nitride Black