The FosTech Complete Bolt Carrier Group in black (brand part no. 6226) is built to full-auto M16 carrier specifications and designed to work in FosTech’s own Echo AR-II and Echo Sport trigger systems, though it drops into any mil-spec .223/5.56/300 Blackout AR-15. The bolt is machined from 9310 alloy steel, shot-peened, and magnetic-particle inspected and marked for reliability, while the carrier itself is heavy-profile 8620 steel with Grade 8 gas key screws torqued and staked to mil-spec. FosTech finishes every part of the group in black nitride, from the bolt and carrier to the cam pin and gas key, for corrosion resistance and a slick bore. It is 100% made in the USA.

Key Specifications

• Compatible with .223/5.56 and .300 Blackout chamberings.
• Bolt cut to full-auto M16 profile, designed to work in FosTech’s Echo AR-II and Echo Sport triggers.
• Bolt machined from 9310 alloy steel, shot-peened and magnetic-particle inspected.
• Extractor is shot-peened hardened tool steel with a Viton mil-spec O-ring.
• Carries 3 mil-spec gas rings for consistent gas sealing.
• Bolt carrier is heavy-profile 8620 steel with Grade 8 gas key screws torqued and staked to mil-spec.
• Finished in black nitride throughout for corrosion resistance and a slick bore.

Frequently Asked Questions

What is this BCG compatible with? It is designed for .223/5.56 and .300 Blackout AR-15 builds, and is purpose-built to work with FosTech’s Echo AR-II and Echo Sport triggers.

What finish does it use? Black nitride throughout the bolt, carrier, cam pin, and gas key for corrosion resistance.

Is this bolt carrier group made in the USA? Yes, it is 100% USA made.

Buy the FosTech Complete Bolt Carrier Group

Round out your build with this FosTech BCG, part of our full AR bolt carrier groups selection. Order it from our Lubbock, Texas gun shop for fast, insured shipping.