RTR .308 Win 18" Mk12 Mod1 Barrel
The big brother has arrived. The RTR .308 Win 18" Mk12 Mod1 takes everything you love about the Mk12 platform and scales it up with real stopping power. Precision-cut and profiled for performance, this barrel brings the punch of .308 with the balance and handling of a proper SPR.
It’s tuned to run right with a rifle-length gas system and the right porting—no guesswork required. And when paired with the legendary AEM5-30 or 30K suppressor, it’s ready to go. Just add the brake and collar system (sold separately) and you're set for a smooth, proven setup.
18" length, and chambered in .308 Win—this one’s built to hit hard and stay tight.
Mk12 vibes. Full-power .308 performance.
Built for the AEM5 life.
- 18" in length
- Rifle Gas System (Gas Tube Included)
- .308 Win Chamber
- 45.4 oz
- 1:10 Twist Rate
- Button Rifled Match Grade SS Blank
- Mk12 Mod 1 /.750" Gas Block
- Threads 5/8x24 with a 11° target crown
- Three Half Fluting Options (Straight, Spiral, and Diamond)
- Multiple Finish Options to choose from
Adding fluting or Cerakote to your barrel? Expect a 1-4 week turnaround for precision work and coating perfection.
For Cerakote Flutes Polish OD finish option, specify your desired Cerakote Color/Code in the checkout notes.
