Midwest Industries Bolt Carrier Group BCG come in Black Nitride, Nickel Boron, DLC Flat Dark Earth and Titanium Nitride! The Carpenter 158 Bolt is heat treated, shot peened, precision ground for perfect dimensions, and MPI Tested. The 4140 Billet Gas Key is properly torqued with Grade 8 fasteners, and properly staked to ensure reliability. The 4140 Billet Cam Pin is nitride treated for wear resistance. The Billet Machined Extractor is machined from solid 4140 bar stock, heat treated and shot peened, coated for reliable extraction, extractor insert, and O-Ring are included. Specifications for Midwest Industries 5.56/AR15 9310 Bolt Carrier Group (BCG): Manufacturer: Midwest Industries Color: Black Finish: Nitride Fabric/Material: Stainless Steel Cartridge: 5.56mm Gun Make: AR Platform Gun Model: M16, AR-15 Weight: 11.4 oz Bolt Material: 9310 Steel Carrier Material: 8620 Steel Country of Origin: USA Gun Type: Rifle Features of Midwest Industries 5.56/AR15 9310 Bolt Carrier Group BCG Assembled Bolt Carrier Group BCG for AR-15/M16 8620 M16 style carrier HM Black Nitride finish Properly heat treated Final grind before plating Carpenter 158 5.56/.223 bolt Heat treated Shot peened Precision ground for perfect dimensions MPI – Magnetic Particle Inspected 4140 Billet Gas Key Properly torqued with Grade 8 fasteners Properly staked to ensure reliability 4140 Cam Pin Heat Treated Billet Machined Extractor 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 Package Contents: Midwest Industries 5.56/AR15 9310 Bolt Carrier Group Extractor Insert O-Ring Included
ARey –
Bought for my first AR build and it has a good finish and feels sturdy. MI is known for having pretty good AR parts and will be testing that when I go to the range. Good price for a BCG considering a lot of parts are on backorder right now.
RickH –
Excellent BCG. The fit and finish are comparable to the best. Perfect staking on the gas key. I've been running it hard in a 16" carbine length gas system, no issues at all. I would definitely buy again.