The actual Rubber City Armory(RCA) Bolt Carrier Group(BCG) has evolved a revolutionary black nitride processing. The AR15 Bolt looks really clean and is said to perform very well. Simply the powerful elements experience any thorough BlacknitridePlus method that features: Molecular Realignment Technology RCA uses a proprietary thermal process that aligns the steel’s crystalline structure to increase strength, hardness and wear properties which extends the life of the tactical component. Polymeric Adsorption: This BCG bind a synthetic fluoropolymer of tetrafluoroethylene to each part to reduce friction and improve wear.
Much more than typical Parkerizing, phosphating or black oxide, Blacknitriding is a thermal chemical diffusion of nitrogen and carbon into the surface of the steel. Only Rubber City Armory high performance parts have increased wear-resistance, fatigue strength, corrosion resistance, lubricity and cosmetic appeal.
Drop-in ready for M16/AR15 weapons. The enhanced features of RCA AR15 Bolt Carrier Group give law enforcement, security professionals and military performance, reliability and the advantage in times of need. Manufactured to meet and exceed DOD MIL-SPEC 961 standards, it’s designed to provide tens of thousands of rounds of reliable performance.
The bolts are mil-spec hardness. QPQ is a heat-treat in and of itself, and multiple mil-spec phosphate bolts were cut into many pieces and the hardness at various depths was measured. The QPQ process RCA uses causes a RC hardness that EXACTLY mirrors the mil-spec case-hardening method at EVERY POINT AND DEPTH on the bolt. A similar was done with typically carrier. This can be the culmination of two years of work.
All of the surfaces are VERY “clean”. The bolt articulated within the carrier much more easily than many of the new phosphate/chrome-lined BCG’s. The finish looks great, and feels “slick”, but oil does not “bead” or “run off”. You can still run this thing “wet” if that’s how you prefer. The staking is text-book and appears very well done via compression and not impact (less chance of shearing a bolt, impact staking causes this, sometimes).