Arm Or Ally .308 Win 12.5″ Government Profile Barrel
The Arm Or Ally .308 Win 12.5″ Government Profile Barrel is manufactured by a leading U.S. barrel manufacturer, machined from 4150 Chrome Moly Vanadium (CMV) steel, features M4 feed ramps, and a deep black, classic QPQ Nitride corrosion-resistant finish. M4 extensions and barrels are finished separately before being torqued to their final specifications for maximum reliability and durability.
This .308 barrel is designed with a Carbine-length gas system, which is ideal for short-barreled rifle (SBR) configurations or pistol builds. With a .750 gas block journal, it provides versatile compatibility with most commonly available gas blocks. Whether you’re setting up a compact precision platform or a rugged duty-style rifle, this barrel delivers exceptional value and performance.
The 12.5″ length offers an ideal balance between compact form factor and ballistic performance in the .308 Winchester caliber. It’s engineered to maintain consistent accuracy, proper cycling, and improved heat management under sustained fire.
Features:
- Caliber: .308 Winchester
- Length: 12.5″
- Profile: Government
- Gas System: Carbine-length
- Gas Block Journal: .750
- Material: 4150 Chrome Moly Vanadium (CMV)
- Finish: QPQ Nitride (inside and out)
- Feed Ramps: M4
- Barrel Extension: M4, torqued after nitride
- Twist Rate: 1:10 (optimized for stability across a wide range of bullet weights)
- Threaded Muzzle: 5/8×24 for standard muzzle devices or suppressor adapters
- Made in the USA
This barrel is an excellent option for those building a high-performance AR-10 or LR-308 style rifle, especially where space and maneuverability are priorities without sacrificing firepower.
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What is the Arm or Ally Brand?
Arm or Ally branded products are manufactured in the same facilities and to the same standards as many popular, high-end brands. Our promise to you is a high-quality product at a more affordable price—100% American-made products backed by the same defect-free warranty as every other product we offer.
...unless you like paying for their marketing and fancy packaging!
Product Information
| Manufacturer | Leading U.S. Manufacturer |
|---|---|
| Gas Block Diameter | .750 |
| Platform | AR10 |
| Caliber | 308 Win |
| Length | 12.5" |
| Twist Rate | 1:10 |
| Gas System | Carbine |
| Material | 4150 Chrome Moly Vanadium |
| Finish | QPQ Nitride |
| Muzzle Thread | 5/8×24 |
| Made in USA | Yes |
| Weight | 33oz |
We fully comply with all federal, state, and local laws regarding the sale of restricted products. We do not market or sell to prohibited jurisdictions, and any attempts to induce illegal activity, including by law enforcement or government agencies, will be rejected and may be reported. All orders are subject to legal verification, and those in violation will be canceled. By using this site, you confirm compliance with all applicable laws.
Arm or Ally is a stocking dealer for all Aero Precision, Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, TriggerTech, HIPERFIRE and was named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!
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