AERO AR15 5.56 BCG W/9310 BLK NTRDThe Aero Precision AR15 5. 56 Bolt Carrier Group with 9310 steel bolt offers superior performance and reliability for your AR15 platform. This BCG features a durable black nitride finish that reduces friction and enhances corrosion resistance. The 9310 steel bolt provides improved strength over traditional Carpenter 158 steel. Each BCG is MPI tested to ensure quality and reliability in demanding conditions. Features Specs: Caliber: 5. 56 NATO . 223
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