Toolcraft 5.56 NATO Black DLC Bolt Carrier Group with Carpenter 158 Bolt
The Toolcraft 5.56 NATO Black DLC Full-Auto Bolt Carrier Group (TCFA-013556C158) combines Toolcraft's established bolt carrier group construction with a black Diamond-Like Carbon coating and a Carpenter 158 steel bolt. Designed for compatible AR-15 pattern rifles chambered in 5.56 NATO and .223 Remington, this complete BCG offers a premium surface finish, durable steel components, and a conventional full-auto profile carrier.
Black Diamond-Like Carbon (DLC) Coating
Unlike conventional black nitride or phosphate finishes, Toolcraft's Diamond-Like Carbon coating is applied using a Physical Vapor Deposition (PVD) process. DLC provides a hard, low-friction surface intended to resist wear and corrosion while simplifying cleaning and maintenance.
The black DLC finish gives this BCG a distinctive dark appearance while retaining the functional benefits of Toolcraft's DLC coating technology. Surface appearance may vary with lighting conditions and the underlying metal finish.
Carpenter 158 Steel Bolt
This specific Toolcraft configuration includes a Carpenter 158 (C158) steel bolt, distinguishing it from Toolcraft variants equipped with 9310 steel bolts. Toolcraft specifies magnetic particle inspection (MPI) and shot peening for its bolts as part of its published component specifications.
For customers comparing bolt carrier groups, the identified C158 bolt material eliminates the uncertainty associated with listings that do not specify which bolt alloy is included.
8620 Steel Full-Auto Profile Carrier
The carrier is manufactured from 8620 steel and features a traditional full-auto profile. This carrier style is also widely used in semiautomatic AR-15 platforms and does not, by itself, convert a semiautomatic firearm to automatic operation.
Toolcraft specifies a 4130 steel gas key secured with Grade 8 fasteners and proper staking. These construction details support the conventional direct-impingement operating system used in compatible AR-15 rifles.
Complete Bolt Carrier Group
The assembly includes the carrier, bolt, cam pin, firing pin, firing pin retaining pin, and associated bolt components. Toolcraft specifies a tool-steel extractor, extractor O-ring, and three mil-spec gas rings in its published bolt specifications.
Toolcraft Lifetime Warranty
Toolcraft backs its products with a manufacturer lifetime warranty. The black DLC C158 bolt carrier group provides an alternative to traditional phosphate, nitride, and nickel-boron finishes for customers selecting components for a compatible AR-15 rifle.
Popular Pairings & Related Products
Compare Toolcraft DLC bolt carrier group finishes and explore the related version available from Huckleberry Arms.