| A popular choice for pinned-and-welded muzzle device configurations. Proudly Made in the USA. |
AR15 13.7" Mid-Length 5.56 NATO Barrel With 1:7 Twist
This 13.7-inch barrel is chambered in 5.56 NATO with a 1:7 twist rate and a government profile. It is a common choice for builders who pin and weld a muzzle device to reach a longer overall length. The mid-length gas system spaces the gas port farther from the chamber than a carbine setup, which can contribute to a smoother recoil impulse. The 1/2x28 thread pattern accepts compatible muzzle devices, and it ships proudly made in the USA.
When planning your build, match a mid-length gas tube and handguard to this configuration. Verify muzzle device threading and plan pin-and-weld work around your overall length goals.
Comparing lengths? See the 14.5" mid-length barrel or browse the full barrels collection to match your platform.
Specifications
| Caliber | 5.56 NATO |
| Barrel Length | 13.7" |
| Twist Rate | 1:7 RH |
| Gas System | Mid-Length |
| Profile | Government |
| Material | 4150 CMV |
| Finish | Black nitride |
| Muzzle Thread | 1/2x28 |
| Gas Block Journal | .750" |
| Gas Port Size | .074" |
| Barrel Extension | M4 |
| Crown | 11° Target Crown |
| Weight | 24.5 ounces |
| Origin | Made in the USA |
Frequently Asked Questions
It's chambered in 5.56 NATO with a 13.7" length, 1:7 RH twist, and government profile. It uses a mid-length gas system, 1/2x28 muzzle threads, a .750" gas block journal, .074" gas port, M4 barrel extension, and an 11° target crown. Material is 4150 CMV with a black nitride finish, weighing 24.5 ounces. Made in the USA.
This length is a common choice for builders who pin and weld a muzzle device to reach a longer overall length. The 1/2x28 thread pattern accepts compatible muzzle devices. Verify your muzzle device threading and plan the pin-and-weld work around your overall length goals.
This barrel uses a mid-length gas system, so pair it with a mid-length gas tube and a matching handguard. Confirm your components are spaced for a mid-length configuration before assembly.
Both share the 5.56 NATO chambering, 1:7 twist, government profile, and mid-length gas system. The main difference is length. If you're comparing options, see the 14.5" mid-length barrel or browse the full barrels collection to match your platform and goals.
Orders ship in 2-3 business days, and free shipping is available on qualifying orders. This barrel is also covered by a 30-day money-back guarantee. If you have questions about your build or order, reach out through the contact page before purchasing.
Specifications
| Caliber | 5.56 |
| Barrel Length | 13.7" |
| Twist Rate | 1:7 |
| Thread Pattern | 1/2x28 |