Fostech Complete Bolt Carrier Group Black

The Fostech Complete Bolt Carrier Group in black is a heavy-profile M16-pattern carrier built for AR-15 shooters who demand durability and precision. Engineered to cycle .223 Remington, 5.56 NATO, and .300 Blackout, this full-spec carrier is designed to work seamlessly with Fostech's Echo AR-II and Echo Sport platforms—and functions reliably in standard AR-15 builds. Every component is manufactured in the USA to exacting military standards, making this a carrier you can trust whether you're running a suppressed short-stroke setup, a precision rifle, or a duty gun.

What sets this carrier apart is the obsessive attention to metallurgy and surface finishing. The bolt is shot-peened and magnetically particle inspected before assembly, ensuring it can handle thousands of rounds without premature wear. The 9310 alloy steel bolt pairs with hardened tool steel extractors and chrome-plated firing pins—materials chosen for their ability to withstand sustained fire and environmental stress. Every critical fastener is Grade 8 and properly torqued and staked to Mil-Spec standards, so you're getting the same build integrity as military-issued hardware.

The black nitride finish resists corrosion and reduces friction across the gas key, carrier body, and cam pin, which means smoother cycling and easier cleaning. At 11.6 ounces, the heavy-profile design is preferred by most AR builders for its balance of reliability and controllability across a wide range of ammunition and shooting conditions. If you're looking for a proven, no-compromise carrier for a new build or a hard-use replacement, Fostech's reputation is backed by the materials and methods they use.

Key Features

• Heavy-profile M16-style design preferred for standard AR-15 builds
• Compatible with .223 Remington, 5.56 NATO, and .300 Blackout
• Shot-peened bolt with magnetic particle inspection for durability
• Hardened tool steel extractor with Viton O-ring and mil-spec gas rings
• Grade 8 gas key screws properly torqued and staked to mil-spec
• Black nitride finish on carrier, gas key, and cam pin for corrosion resistance and reduced friction
• 100% USA manufactured

Specifications

Frequently Asked Questions

Will this bolt carrier group work with my standard AR-15 build?

Yes. The heavy-profile M16-style design is the preferred configuration for most AR-15 builds and will function reliably across a wide range of setups. It's also engineered to work specifically with Fostech's Echo AR-II and Echo Sport platforms.

What calibers does this carrier support?

The Fostech carrier is compatible with .223 Remington, 5.56 NATO, and .300 Blackout.

What does black nitride finish do?

Black nitride provides superior corrosion resistance, reduces friction during cycling, and makes the carrier easier to clean and maintain. It's applied to the carrier body, gas key, and cam pin for maximum protection in harsh environments.

Is this carrier manufactured in the USA?

Yes. The Fostech Complete Bolt Carrier Group is 100% USA made.