Lantac M-SPEC BCG .223/5.56mm NiB

The Lantac M-SPEC bolt carrier group is built to mil-spec dimensions with targeted enhancements for improved durability and reduced friction in AR-15 platform builds. The carrier is full-auto style with increased mass, precision machined from 8620 steel and finished with a Nickel Boron (NiB) coating for greater corrosion resistance and lubricity. The bolt is produced to military specification and is shot-peened and hard-turned to ensure consistent fit and function. Each BCG includes a Lantac CP-R360 domed head cam pin machined from 17-4PH stainless steel and hardened to H900 to reduce wear within the upper receiver.

Key Specifications

• The caliber is .223/5.56mm.
• The carrier material is 8620 steel and is case hardened and hard turned/ground.
• The carrier finish is NiB (Nickel Boron) for improved corrosion resistance and lubricity.
• The bolt is machined from Carpenter 158 or 9310 and is shot peened and hard turned.
• The cam pin is a Lantac CP-R360 domed head made from 17-4PH stainless steel hardened to H900.
• The carrier is full-auto style with increased mass for consistent operation.
• The listed overall dimensions are 1.70 x 3.80 x 11.00.
• The listed length is 11 (as provided).
• The listed weight is 0.815 (as provided).
• Designed as an AR-15 accessory that follows mil-spec dimensions and tolerances.

Built to raise certain performance characteristics above standard mil-spec while retaining a practical price profile, the Lantac M-SPEC BCG pairs a NiB-coated carrier with precision-machined components to deliver a durable, low-friction drop-in option for AR-15 builds and upgrades where reliable, long-lasting operation is a priority.