Brownells194199657
Brownells Ar-15 5.56Mm Bolt Carrier Group, Nitride$105.23
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Availability: In Stock
Current Stock: Out of stock
Building a 9mm AR-15 pistol-caliber carbine starts with a purpose-built bolt carrier group—and the Brownells AR-15 9mm Bolt Carrier Group in black nitride is engineered specifically for that job. If you're assembling a 9mm AR from scratch or upgrading an existing rifle to run pistol caliber, this BCG handles the lower bolt thrust and firing characteristics that 9mm demands, making it the foundation of a reliable, tuned PCC platform.
Construction matters on a bolt carrier group. Brownells machines this unit from a single piece of steel billet, giving it the integrity and consistency you need when operating at the pressures of 9mm. The black nitride finish does real work here—it reduces friction, resists corrosion, and makes cleaning easier after a range session. The captured firing pin design eliminates the risk of slam fires, a critical safety feature when running the gentler spring rates that 9mm PCCs use.
Flexibility is built in. The removable weight pin lets you adjust the bolt carrier group's cyclic characteristics to work with different buffer systems and tuning preferences—useful if you're dialing in a platform that runs suppressed or need to match it to a specific buffer weight. The group is compatible with both Glock and Colt magazines, covering the two most common magazine platforms in 9mm AR builds.
| Caliber | 9mm |
| Platform | AR-15 |
| Material | Steel (single-piece billet) |
| Finish | Black Nitride |
| Magazine Compatibility | Glock, Colt |
| Firing Pin | Captured |
| Weight Pin | Removable |
Yes. This BCG is designed to drop into a standard AR-15 platform lower and cycle 9mm ammunition. It requires a 9mm-specific magazine well or use of dedicated 9mm magazines; verify your lower's configuration before installing.
The weight pin lets you adjust the bolt carrier group's mass and cycling rate to match different buffer systems and tuning preferences. You can remove it or adjust it to optimize reliability and felt recoil for your specific setup, especially useful in suppressed or unsuppressed configurations.
Yes. This bolt carrier group is compatible with both Glock and Colt magazine patterns, giving you flexibility in your magazine selection for a 9mm AR build.
The captured firing pin prevents slam fires—a risk that can occur with lighter spring pressures used in 9mm carbines. It keeps the pin contained and controlled, adding a safety margin to your firearm.
SKU: 194200139 • Weight: 1oz
Availability: In Stock
Current Stock: Out of stock
Building a 9mm AR-15 pistol-caliber carbine starts with a purpose-built bolt carrier group—and the Brownells AR-15 9mm Bolt Carrier Group in black nitride is engineered specifically for that job. If you're assembling a 9mm AR from scratch or upgrading an existing rifle to run pistol caliber, this BCG handles the lower bolt thrust and firing characteristics that 9mm demands, making it the foundation of a reliable, tuned PCC platform.
Construction matters on a bolt carrier group. Brownells machines this unit from a single piece of steel billet, giving it the integrity and consistency you need when operating at the pressures of 9mm. The black nitride finish does real work here—it reduces friction, resists corrosion, and makes cleaning easier after a range session. The captured firing pin design eliminates the risk of slam fires, a critical safety feature when running the gentler spring rates that 9mm PCCs use.
Flexibility is built in. The removable weight pin lets you adjust the bolt carrier group's cyclic characteristics to work with different buffer systems and tuning preferences—useful if you're dialing in a platform that runs suppressed or need to match it to a specific buffer weight. The group is compatible with both Glock and Colt magazines, covering the two most common magazine platforms in 9mm AR builds.
| Caliber | 9mm |
| Platform | AR-15 |
| Material | Steel (single-piece billet) |
| Finish | Black Nitride |
| Magazine Compatibility | Glock, Colt |
| Firing Pin | Captured |
| Weight Pin | Removable |
Yes. This BCG is designed to drop into a standard AR-15 platform lower and cycle 9mm ammunition. It requires a 9mm-specific magazine well or use of dedicated 9mm magazines; verify your lower's configuration before installing.
The weight pin lets you adjust the bolt carrier group's mass and cycling rate to match different buffer systems and tuning preferences. You can remove it or adjust it to optimize reliability and felt recoil for your specific setup, especially useful in suppressed or unsuppressed configurations.
Yes. This bolt carrier group is compatible with both Glock and Colt magazine patterns, giving you flexibility in your magazine selection for a 9mm AR build.
The captured firing pin prevents slam fires—a risk that can occur with lighter spring pressures used in 9mm carbines. It keeps the pin contained and controlled, adding a safety margin to your firearm.
SKU: 194200139 • Weight: 1oz