The Angstadt Arms 5.56 NATO Bolt Carrier Group (brand part no. AA56BCGNIT) is machined to mil-spec dimensions and finished in a durable black nitride coating for smooth, reliable cycling. Angstadt Arms builds this BCG to the same standard it supplies to law enforcement and military customers, so it is a drop-in upgrade or replacement for any mil-spec AR-15. The nitride finish resists corrosion and fouling better than standard phosphate coatings, which means easier cleaning and longer service life. It is a solid choice for a duty-grade rifle, a home-defense carbine, or a range build that needs to run hard.

Key Specifications

• It is chambered for 5.56 NATO, matching the standard AR-15 cartridge dimension.
• The carrier is finished in black nitride, a coating that resists corrosion and fouling for smoother, cleaner cycling than phosphate.
• It is machined to mil-spec dimensions, so it drops into any standard AR-15 upper without fitting work.
• The complete assembly weighs approximately 0.5 pounds, in line with a standard full-mass carbine BCG.

Frequently Asked Questions

What caliber is this BCG built for? 5.56 NATO AR-15 platforms.

What finish does it have? A black nitride coating for corrosion resistance and smoother cycling.

Is it mil-spec? Yes, it is machined to mil-spec dimensions for drop-in compatibility.

Buy the Angstadt Arms 5.56 NATO Black Nitride Bolt Carrier Group

Order the Angstadt Arms 5.56 NATO BCG from Angstadt Arms through our AR bolt carrier groups lineup. It ships fast from our Lubbock, Texas gun shop, fully insured.