Magnetic particle inspected (MPI) to ASTM E1444 aircraft quality inspection standards for molecular soundness and longer life of all the below-mnetioned metal parts. 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 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
3 reviews for BRG 5.56mm/.223 Complete Bolt Carrier Groups
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Brian Reynolds –
Completely useless BCG. It was so far out of spec that it wouldn't even seat into the upper receiver. It would bind and get stuck before seating into position and was even difficult to remove. Thats what I get for trying an unfamiliar brand on sale. Yes I did try another bcg to make sure it wasn't my receiver that was out of spec. This has already been shipped back as a return and I will pay a few dollars more for one of my regular trusted brands.
JM –
Ordered this for a new set-up. Took it to the range and had no issues.
Kalaka –
Great fit and finish, just what I needed to complete my build at a good price. I’ve put 500 rounds through it so far with zero issues. I will purchase again for my next build.