The Lantac USA E-BCG (Lantac part number LA00223) is a .223 Rem/5.56 NATO bolt carrier group built with M16-style mass for increased lock time, precision machined from 8620 steel with a shot-peened, Magnetic Particle Inspected bolt. Rather than Lantac’s QPQ nitride finish, this carrier is coated with Electroless Nickel Boron through Lantac’s patented UCT EXO process, giving a friction coefficient of just .02 and a surface hardness of 82 to 85 Rockwell C. The same patented shrouded, forward-facing gas ports carry over from Lantac’s nitride carriers, redirecting gas for a flatter, smoother cycle with less upper receiver pressurization when shooting suppressed, and the same CP-R360 domed cam pin protects the upper receiver from wear at the carrier’s most contact-prone point.

Key Specifications

• Chambered for .223 Rem/5.56 NATO, matching standard AR-15 platform barrels.
• Built with M16-style carrier mass for increased lock time and smoother cycling on both semi-auto and full-auto lower profiles.
• The carrier is machined from 8620 steel, heat treated and hard turned and ground.
• The bolt is shot peened and Magnetic Particle Inspected.
• Finish is Electroless Nickel Boron via Lantac’s patented UCT EXO process, with a .02 friction coefficient and 82-85 Rockwell C surface hardness.
• Patented shrouded, forward-facing gas ports redirect gas for a flatter, smoother-running cycle with less upper receiver pressurization when suppressed.
• The cam pin is Lantac’s CP-R360 domed design, machined from 17-4PH stainless steel.
• The gas key is staked with gasket sealer, and only Grade 8 hardened fasteners are used in assembly.
• Carrier weight is 11.7 oz, tuned specifically to help increase lock time.
• Hard chrome surfaces meet MIL-STD-171.

Frequently Asked Questions

How is this carrier different from Lantac’s nitride BCG? It uses Lantac’s patented Electroless Nickel Boron (NiB) UCT EXO coating instead of QPQ Nitride, giving an even lower friction coefficient.

Does this BCG run cooler when shooting suppressed? Yes, Lantac’s shrouded gas port design reduces upper receiver pressurization and helps the system run cooler and cleaner when suppressed.

What is the surface hardness of the NiB coating? The Nickel Boron coating measures 82 to 85 on the Rockwell C scale, with a friction coefficient of about .02.

Buy the Lantac E-BCG Nickel Boron

Run your 5.56 AR-15 with a bolt carrier group engineered around real gas-flow improvements and a coating built for extreme dry lubricity. Lantac’s NiB E-BCG brings the same shrouded-port design in a distinct finish. Browse more of our AR bolt carrier group selection and order from our Lubbock, Texas gun shop for fast, direct shipping.