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SKU: GAG_RES-MWMI-BCG-NIT
Midwest Industries 556 Bolt Carrier Group C158 Carpenter Steel Features: Midwest Industries is dedicated to manufacturing quality firearm components and accessories for a wide range of rifle platforms. Midwest Industries 556 Bolt Carrier Group C158 Carpenter Steel Specifications: Assembled Bolt Carrier Group for AR-15/M16 8620 M16 style carrier Black Nitride finish Properly heat treated Final grind before plating 9310 Steel 5.56/.223 bolt Heat treated Shot peened Precision ground for perfect dimensions Black Nitride finish MPI - Magnetic Particle Inspected 4140 Gas Key Black Nitride finish Properly torqued with Grade 8 fasteners Properly staked to ensure reliability 4140 Cam Pin Heat Treated Black Nitride finish Machined from solid 4140 bar stock heat treated and shot peened Phosphate coated for reliable extraction Extractor insert included O-Ring included Firing pin precision machined from 17-4 H-900 Stainless Steel 100% USA Made Midwest Industries Limited Lifetime Warranty