Radian Weapons126513752
Radian Bolt Carrier Group - Black Nitride 5.56 NATO for AR-15$217.83
Availability: In Stock
Current Stock: Out of stock
The TacFire AR-15 5.56 NATO bolt carrier group is the heart of your rifle's cycling system. This U.S.-made BCG handles the critical job of stripping rounds from your magazine, chambering them, firing, and extracting spent brass—all while managing the gas impulse that runs your gun. Whether you're building a new rifle, upgrading an existing platform, or keeping a spare on hand, a quality bolt carrier group matters: it's where reliability starts.
TacFire's nitride-finished BCG is built from 9130 steel (bolt) and 8620 steel (carrier), both materials proven in AR platforms. The nitride process case-hardens the surface, giving you superior resistance to heat and corrosion compared to a plain parkerized or phosphate finish. You get that durable gloss-black look along with the toughness to handle repeated firing cycles and debris-laden conditions. The BCG is fully MPI tested—magnetic particle inspection verifies the steel has no hidden structural flaws before it leaves the factory.
This is a standard semi-auto AR-15 bolt carrier group compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend uppers. It features forward assist notches for easier manipulation and shoots smooth across all those cartridge options. Made in the USA, it's the kind of straightforward, no-frills component that pairs well with quality upper and lower receivers to give you a dependable rifle you can trust.
| Caliber Compatibility | .223 Remington, 5.56 NATO, .300 Blackout, .350 Legend |
| Bolt Material | 9130 Steel |
| Carrier Material | 8620 Steel |
| Finish | Nitride |
| Weight | 11.7 oz (BCG); 7.5 oz (Bolt) |
| Testing | MPI Tested, Shoot Peened |
| Compatibility | AR-15 Platform |
The TacFire BCG is compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend when paired with the appropriate barrel and upper receiver. It's a standard AR-15 pattern bolt carrier group, so it will cycle any of these cartridges reliably.
MPI (magnetic particle inspection) is a quality control process that detects structural flaws in the steel—things like hidden cracks or voids that could cause catastrophic failure under the stress of firing. MPI testing before shipment ensures the bolt carrier group is sound and safe to use.
Nitride case-hardens the surface of the steel through a heat-treating process, creating a harder, more wear-resistant layer. This finish provides better resistance to heat and corrosion than traditional finishes, making it ideal for hard use and less frequent cleaning. The gloss-black appearance also looks sharp on the gun.
Yes—this is a standard AR-15 pattern bolt carrier group and will work with any AR-15 platform upper and lower receiver. It includes forward assist notches for compatibility with standard uppers. Confirm your barrel is chambered in one of the compatible calibers (.223 Rem, 5.56 NATO, .300 BLK, or .350 Legend).
SKU: 200191211 • Width: 4in • Height: 1in • Depth: 9.85in • Weight: 0.73oz
Availability: In Stock
Current Stock: Out of stock
The TacFire AR-15 5.56 NATO bolt carrier group is the heart of your rifle's cycling system. This U.S.-made BCG handles the critical job of stripping rounds from your magazine, chambering them, firing, and extracting spent brass—all while managing the gas impulse that runs your gun. Whether you're building a new rifle, upgrading an existing platform, or keeping a spare on hand, a quality bolt carrier group matters: it's where reliability starts.
TacFire's nitride-finished BCG is built from 9130 steel (bolt) and 8620 steel (carrier), both materials proven in AR platforms. The nitride process case-hardens the surface, giving you superior resistance to heat and corrosion compared to a plain parkerized or phosphate finish. You get that durable gloss-black look along with the toughness to handle repeated firing cycles and debris-laden conditions. The BCG is fully MPI tested—magnetic particle inspection verifies the steel has no hidden structural flaws before it leaves the factory.
This is a standard semi-auto AR-15 bolt carrier group compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend uppers. It features forward assist notches for easier manipulation and shoots smooth across all those cartridge options. Made in the USA, it's the kind of straightforward, no-frills component that pairs well with quality upper and lower receivers to give you a dependable rifle you can trust.
| Caliber Compatibility | .223 Remington, 5.56 NATO, .300 Blackout, .350 Legend |
| Bolt Material | 9130 Steel |
| Carrier Material | 8620 Steel |
| Finish | Nitride |
| Weight | 11.7 oz (BCG); 7.5 oz (Bolt) |
| Testing | MPI Tested, Shoot Peened |
| Compatibility | AR-15 Platform |
The TacFire BCG is compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend when paired with the appropriate barrel and upper receiver. It's a standard AR-15 pattern bolt carrier group, so it will cycle any of these cartridges reliably.
MPI (magnetic particle inspection) is a quality control process that detects structural flaws in the steel—things like hidden cracks or voids that could cause catastrophic failure under the stress of firing. MPI testing before shipment ensures the bolt carrier group is sound and safe to use.
Nitride case-hardens the surface of the steel through a heat-treating process, creating a harder, more wear-resistant layer. This finish provides better resistance to heat and corrosion than traditional finishes, making it ideal for hard use and less frequent cleaning. The gloss-black appearance also looks sharp on the gun.
Yes—this is a standard AR-15 pattern bolt carrier group and will work with any AR-15 platform upper and lower receiver. It includes forward assist notches for compatibility with standard uppers. Confirm your barrel is chambered in one of the compatible calibers (.223 Rem, 5.56 NATO, .300 BLK, or .350 Legend).
SKU: 200191211 • Width: 4in • Height: 1in • Depth: 9.85in • Weight: 0.73oz