The Odin Works AR-15 Bolt Carrier Group (brand part number ACC.223BCG) is a mil-spec-dimension BCG built for AR-15/M4-compatible rifles chambered in .223/5.56. The carrier is case-hardened 8620 steel finished in black nitride, with a 4130 steel gas key attached with Grade 8 hardware and properly staked into a milled valley for correct positioning. The bolt itself is machined from case-hardened 9310 steel to true mil-spec dimensions, with CNC-ground external surfaces, a hardened 4340 cam pin, a hard-chrome-coated 8740 steel mil-spec firing pin, and a 4340 steel mil-spec extractor with a spring-and-O-ring combination. Every unit is magnetic-particle inspected, high-pressure tested, and made in the USA.

Key Specifications

• Fits AR-15/M4-compatible rifles, chambered .223/5.56.
• Built to true mil-spec dimensions.
• Carrier is case-hardened 8620 steel, finished in black nitride.
• Bolt is machined from case-hardened 9310 steel with CNC-ground external surfaces.
• Gas key is 4130 steel, attached with Grade 8 hardware and properly staked.
• Cam pin is hardened 4340 steel.
• Firing pin is Mil-Spec 8740 steel, center-less ground and hard chrome coated.
• Extractor is 4340 steel Mil-Spec with a spring-and-O-ring combination.
• Every unit is magnetic-particle inspected and high-pressure tested.
• Made in the USA.

Frequently Asked Questions

What steel is the bolt made from? Case-hardened 9310 steel, CNC ground to true mil-spec dimensions.

Is every BCG tested? Yes, each one is magnetic-particle inspected and high-pressure tested.

Where is it made? In the USA.

Buy the Odin Works AR-15 Bolt Carrier Group

Get a fully tested, true mil-spec BCG built to run reliably. Order it from our Odin Works lineup, part of our AR bolt carrier groups selection, at our Lubbock, Texas gun shop for fast, direct shipping.