Brownells194199752
Brownells M16 458 Socom/450 Bushmaster Bolt Carrier Group Nitride$116.80
Availability: In Stock
Current Stock: Out of stock
The Brownells M16 Lightweight Bolt Carrier Group Nitride is a drop-in upgrade for AR-15 shooters who want to cut weight and manage recoil without tearing into their rifle's receiver. This complete, ready-to-install assembly arrives torqued, staked, and fitted with the extractor spring and O-ring already in place—no gunsmithing required. At 8.2 ounces, it's engineered to reduce the mass you're cycling on every round, which translates to softer felt recoil and a snappier handling rifle, especially noticeable in lightweight builds or during extended range sessions.
Built from 8620 tool steel and paired with a heavy-duty 9310 bolt that's magnetic-particle inspected for quality, this carrier delivers the durability you expect from a Brownells component. The nitride finish provides a hard, corrosion-resistant surface that holds up to the abuse of semi-auto duty and typical maintenance cycles. It's compatible with .223 Rem., 5.56 NATO, 300 Blackout, and .204 Ruger AR platforms, so whether you're running a precision rifle, a hunting gun, or a fast-shooting 300 BLK, this swap works across calibers without fitment headaches.
If you're building a lightweight rifle—maybe shaving ounces for a mountain hunt or dialing in a speed-focused competition setup—this carrier group lets you achieve meaningful weight reduction without compromising reliability or requiring a gunsmiths help. It slots in alongside your existing bolt catch, charging handle, and buffer system, making it one of the simplest internal upgrades you can do yourself.
| Weight | 8.2 ounces |
| Material (Carrier) | 8620 tool steel |
| Material (Bolt) | 9310 tool steel |
| Finish | Nitride |
| Condition | Fully assembled with gas key torqued and staked |
| Compatible Calibers | 5.56 NATO, .223 Rem., 300 Blackout, .204 Ruger |
Yes, as long as your AR-15 is chambered in 5.56 NATO, .223 Rem., 300 Blackout, or .204 Ruger. It's an M16-pattern carrier, which is the standard for modern AR-15s and accepts all standard components.
We can confirm this assembly weighs 8.2 ounces. The weight savings depends on your current setup, but using a lightweight carrier is one of the most effective ways to reduce reciprocating mass in a rifle build.
No. It arrives fully assembled with the gas key already torqued and staked, the extractor spring installed, and the O-ring in place. You simply drop it into your upper receiver—no special tools or expertise required.
Nitride is a hard, durable coating that resists corrosion and wear from repeated cycling and cleaning. It maintains its finish longer than bare steel and cleans up easily.
SKU: 194199672 • Weight: 0.52oz
Availability: In Stock
Current Stock: Out of stock
The Brownells M16 Lightweight Bolt Carrier Group Nitride is a drop-in upgrade for AR-15 shooters who want to cut weight and manage recoil without tearing into their rifle's receiver. This complete, ready-to-install assembly arrives torqued, staked, and fitted with the extractor spring and O-ring already in place—no gunsmithing required. At 8.2 ounces, it's engineered to reduce the mass you're cycling on every round, which translates to softer felt recoil and a snappier handling rifle, especially noticeable in lightweight builds or during extended range sessions.
Built from 8620 tool steel and paired with a heavy-duty 9310 bolt that's magnetic-particle inspected for quality, this carrier delivers the durability you expect from a Brownells component. The nitride finish provides a hard, corrosion-resistant surface that holds up to the abuse of semi-auto duty and typical maintenance cycles. It's compatible with .223 Rem., 5.56 NATO, 300 Blackout, and .204 Ruger AR platforms, so whether you're running a precision rifle, a hunting gun, or a fast-shooting 300 BLK, this swap works across calibers without fitment headaches.
If you're building a lightweight rifle—maybe shaving ounces for a mountain hunt or dialing in a speed-focused competition setup—this carrier group lets you achieve meaningful weight reduction without compromising reliability or requiring a gunsmiths help. It slots in alongside your existing bolt catch, charging handle, and buffer system, making it one of the simplest internal upgrades you can do yourself.
| Weight | 8.2 ounces |
| Material (Carrier) | 8620 tool steel |
| Material (Bolt) | 9310 tool steel |
| Finish | Nitride |
| Condition | Fully assembled with gas key torqued and staked |
| Compatible Calibers | 5.56 NATO, .223 Rem., 300 Blackout, .204 Ruger |
Yes, as long as your AR-15 is chambered in 5.56 NATO, .223 Rem., 300 Blackout, or .204 Ruger. It's an M16-pattern carrier, which is the standard for modern AR-15s and accepts all standard components.
We can confirm this assembly weighs 8.2 ounces. The weight savings depends on your current setup, but using a lightweight carrier is one of the most effective ways to reduce reciprocating mass in a rifle build.
No. It arrives fully assembled with the gas key already torqued and staked, the extractor spring installed, and the O-ring in place. You simply drop it into your upper receiver—no special tools or expertise required.
Nitride is a hard, durable coating that resists corrosion and wear from repeated cycling and cleaning. It maintains its finish longer than bare steel and cleans up easily.
SKU: 194199672 • Weight: 0.52oz