The Midwest Industries 5.56/AR-15 Enhanced Bolt Carrier Group (Midwest Industries part no. MI-BCG-556EH) is a full M16-profile carrier machined from 8620 billet steel, paired with a 9310 steel bolt that’s hardened and shot-peened for durability. Midwest Industries finishes the group in Black Nitride for corrosion resistance and stakes the 4130 steel gas key with Grade 8 hardware to keep it locked down under recoil. This Enhanced BCG gives 5.56/AR-15 owners a mil-spec-or-better bolt carrier group upgrade backed by a limited lifetime warranty.

Key Specifications

• Built for 5.56/AR-15 platforms.
• Part of Midwest Industries’ Enhanced BCG line.
• Bolt machined from 9310 steel, hardened and shot-peened for durability.
• Carrier machined from 8620 billet steel to the full M16 (full-auto) profile.
• Finished in a Black Nitride coating for corrosion resistance.
• Gas key is 4130 steel, torqued with Grade 8 hardware and properly staked to resist loosening under recoil.
• Backed by a limited lifetime warranty from Midwest Industries.

Frequently Asked Questions

What platform does this BCG fit? It’s built for 5.56/AR-15 platforms.

What material and profile is the carrier? It’s a full M16 (full-auto) profile carrier machined from 8620 billet steel, paired with a 9310 steel bolt.

Is the gas key staked? Yes, the 4130 steel gas key is torqued with Grade 8 hardware and properly staked for reliability.

Buy the Midwest Industries 5.56/AR-15 Enhanced Bolt Carrier Group

Order this BCG from our Lubbock, Texas gun shop and we’ll have it ready to ship to your door. Shop the full Midwest Industries lineup or browse our complete AR bolt carrier groups selection.