Brownells194200136
Brownells Ar-15/A1 5.56Mm 20'' 1-12 Twist Rifle Barrel Assembly$247.99
Availability: In Stock
Current Stock: Out of stock
The Brownells AR-15/A1 Carbine 5.56mm 11.5" 1-12 Twist Barrel Assembly is purpose-built for shooters and builders who want authentic retro rifle aesthetics or a lightweight, compact setup. This complete barrel assembly delivers the classic A1 profile that defined early-generation AR carbines while housing all the components you need to get up and running—front sight base, gas block, barrel nut, handguard cap, and more are already installed and ready to go.
Built from ordnance-grade 4150 chrome-moly steel with a durable black phosphate finish, this barrel pairs a 1-12" twist rate with a 5.56 NATO chamber and chrome-lined bore for reliable function with modern ammunition. The 11.5" length keeps overall weapon profile compact, making this barrel a solid choice for SBR builds, PDW setups, or anyone prioritizing maneuverability. It uses a carbine-length gas system and accepts standard AR-pattern components. The muzzle is threaded 1/2"-28 TPI, accommodating both period-correct flash suppressors and modern suppressors or muzzle devices. Magnetic particle inspection catches hidden material flaws before assembly ships, so you're getting a barrel vetted for durability and safety.
Whether you're building an XM177 reproduction, assembling a lightweight SBR, or simply want the look and feel of Cold War–era hardware on a modern platform, this Brownells barrel gives you an authentic profile without sacrificing function or reliability. Note that NFA regulations apply to any build under 16" overall length; you are responsible for compliance.
| Barrel Length | 11.5" |
| Chambering | 5.56 NATO |
| Twist Rate | 1-12" |
| Material | 4150 Chrome-Moly Steel |
| Bore | Chrome-lined |
| Finish | Black Phosphate |
| Gas System | Carbine-length |
| Muzzle Threads | 1/2"-28 TPI |
| Included Components | Front sight base, gas block, barrel nut, handguard cap, sight post, detent, spring, sling swivel, delta ring, snap ring, and barrel extension |
This barrel assembly uses a carbine-length gas system.
Yes. The Brownells AR-15/A1 Carbine barrel is designed specifically for XM177 reproductions and retro builds, matching the exterior profile of early carbines from the 1960s through 2000s.
The barrel is threaded 1/2"-28 TPI, so it accepts both period-correct retro flash suppressors and modern muzzle devices or suppressors.
The barrel assembly arrives fully equipped with front sight base, gas block, barrel nut, handguard cap, sight post, detent, spring, sling swivel, delta ring, snap ring, and barrel extension already installed.
SKU: 194199637 • Weight: 1.6oz
Availability: In Stock
Current Stock: Out of stock
The Brownells AR-15/A1 Carbine 5.56mm 11.5" 1-12 Twist Barrel Assembly is purpose-built for shooters and builders who want authentic retro rifle aesthetics or a lightweight, compact setup. This complete barrel assembly delivers the classic A1 profile that defined early-generation AR carbines while housing all the components you need to get up and running—front sight base, gas block, barrel nut, handguard cap, and more are already installed and ready to go.
Built from ordnance-grade 4150 chrome-moly steel with a durable black phosphate finish, this barrel pairs a 1-12" twist rate with a 5.56 NATO chamber and chrome-lined bore for reliable function with modern ammunition. The 11.5" length keeps overall weapon profile compact, making this barrel a solid choice for SBR builds, PDW setups, or anyone prioritizing maneuverability. It uses a carbine-length gas system and accepts standard AR-pattern components. The muzzle is threaded 1/2"-28 TPI, accommodating both period-correct flash suppressors and modern suppressors or muzzle devices. Magnetic particle inspection catches hidden material flaws before assembly ships, so you're getting a barrel vetted for durability and safety.
Whether you're building an XM177 reproduction, assembling a lightweight SBR, or simply want the look and feel of Cold War–era hardware on a modern platform, this Brownells barrel gives you an authentic profile without sacrificing function or reliability. Note that NFA regulations apply to any build under 16" overall length; you are responsible for compliance.
| Barrel Length | 11.5" |
| Chambering | 5.56 NATO |
| Twist Rate | 1-12" |
| Material | 4150 Chrome-Moly Steel |
| Bore | Chrome-lined |
| Finish | Black Phosphate |
| Gas System | Carbine-length |
| Muzzle Threads | 1/2"-28 TPI |
| Included Components | Front sight base, gas block, barrel nut, handguard cap, sight post, detent, spring, sling swivel, delta ring, snap ring, and barrel extension |
This barrel assembly uses a carbine-length gas system.
Yes. The Brownells AR-15/A1 Carbine barrel is designed specifically for XM177 reproductions and retro builds, matching the exterior profile of early carbines from the 1960s through 2000s.
The barrel is threaded 1/2"-28 TPI, so it accepts both period-correct retro flash suppressors and modern muzzle devices or suppressors.
The barrel assembly arrives fully equipped with front sight base, gas block, barrel nut, handguard cap, sight post, detent, spring, sling swivel, delta ring, snap ring, and barrel extension already installed.
SKU: 194199637 • Weight: 1.6oz