This is a complete bolt carrier group built to M16 full-auto cut specifications and finished in black nitride for corrosion resistance and durability. It is designed to function with the Echo AR-II and the Echo Sport and is intended for use in AR-style platforms compatible with the listed calibers. Major components are made from inspected alloy steels and assembled to Mil-Spec standards where noted. The assembly is described as 100% USA made.
Key Specifications
- Compatibility supports .223 / 556 / 300BLK.
- The bolt is made from 9310 alloy steel and is shot peened, magnetic particle inspected, and marked.
- The extractor is shot peened hardened tool steel and uses a Viton Mil-Spec O-ring.
- The bolt carrier is constructed from 8620 steel in a heavy profile M16-style design.
- The gas key is made from 4130 steel and secured with Grade 8 screws that are torqued and staked to Mil-Spec.
- The cam pin is manufactured from 4140 steel with a black nitride finish.
- The firing pin is 8740 steel, centerless ground and hard chrome plated, with a listed weight of 11.6 ounces.
- The finish on major components is black nitride.
- The assembly includes three Mil-Spec gas rings.
- Declared origin is 100% USA made.
This complete BCG provides a durable, Mil-Spec–oriented foundation for AR-style builds where a heavy-profile M16-style carrier and robust bolt assembly are desired. Its component selection and finishes are aimed at long-term serviceability and straightforward integration into compatible platforms.
