Description
MPN: 55BA419
Features:
- Mil-Spec M16 Profile Carrier: Full-auto profile carrier for enhanced reliability and smoother cycling in AR-15 platforms
- Complete Bolt Carrier Group: Includes carrier, bolt, firing pin, cam pin, and retaining pin—ready for drop-in use
- Durable Steel Construction: Built from high-strength steel to handle high round counts and hard use
- Reliable Gas System Operation: Properly staked gas key ensures consistent gas flow and dependable cycling
- Smooth, Consistent Performance: Precision machining supports reliable feeding, extraction, and ejection
- Versatile Compatibility: Works with most AR-15 rifles chambered in 5.56 NATO, .223 Remington, and 300BLK
- Lifetime Quality Guarantee: Backed by CMMG’s Lifetime Quality Guarantee
Specifications:
- Caliber: 5.56 NATO / .223 Rem / 300 Blackout
- Material:
- Carrier: Chrome Lined 8620 Tool Steel
- Bolt: 9310 Steel
- Finish: Phosphate
- Weight: 11.5 oz.
- Profile: M16
**A full-auto (A.K.A. M16) bolt carrier installed in a standard semi-auto AR-15 will not make the gun fire full-auto.
Compatibility:
- AR-15
Includes:
- 1x Bolt Assembly
- 1x Extractor
- 1x Cam Pin
- 1x Bolt Carrier
- 1x Carrier Key
- 1x Firing Pin
- 1x Firing Pin Retaining Pin
Details:
The CMMG Mil-Spec M16 Bolt Carrier Group isn’t trying to reinvent anything—and that’s exactly why it works. It follows the standard M16 pattern, giving you a full-auto profile carrier that’s known for reliable cycling and consistent operation across a wide range of AR-15 setups.
If you’re building a rifle and just want something dependable without chasing boutique features, this is the kind of BCG you drop in and forget about.
Full-Auto Profile For Smoother Cycling
The M16-style carrier adds a bit more mass compared to lightweight or semi-auto carriers. That extra weight helps slow the cycle slightly, which can make the rifle feel more controlled—especially on carbines that tend to run a little overgassed.
It’s a subtle difference, but one that shows up when you’re shooting faster or running higher-pressure ammo.
Built To Mil-Spec Standards
This BCG is built around mil-spec dimensions, so it fits and functions with standard AR-15 components. The carrier and bolt are designed for durability and consistent engagement, making it suitable for general-purpose rifles, training setups, or duty-style builds.
Gas key staking is properly done to keep things secure over time, which is one of those details that matters more the longer you run the rifle.
A No-Nonsense Foundation For Any Build
You can spend a lot of time chasing features in a bolt carrier group, but at the end of the day, reliability is what matters. This one focuses on that.
If you want a proven, mil-spec M16 BCG that delivers consistent performance without unnecessary extras, the CMMG Bolt Carrier Group is a solid choice that keeps your rifle running the way it should.
