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The 6mm ARC has quickly earned its reputation as the most capable long-range cartridge you can run on a standard AR-15 lower, and this Odin Works barrel is a clean way to get there. Developed by Hornady to squeeze big performance out of the small-frame platform, the 6mm ARC pushes heavy, high-BC bullets in the 103 to 108 grain range with mild recoil and a flat trajectory that reaches out where the .223 runs out of steam. Drop this 18-inch barrel into your build and you have a rifle that spots its own hits and stretches your effective range without moving up to a heavier AR-10.
This one is cut from 416R stainless steel, a barrel-grade alloy that takes crisp, defined rifling and holds up to real use. It runs a DMR profile with a 1:7.5 twist to stabilize those long, heavy match bullets, and it wears a 5/8×24 threaded muzzle so your favorite brake, comp, or suppressor threads right on. Hand-lapped bore work and M4 feed ramps round out the package, and Odin Works backs it with a 1 MOA accuracy guarantee, so the precision is not just marketing talk.
What makes this kit friendly for a home build is the included stainless tunable gas block and rifle-length gas tube. The adjustable block lets you throttle the gas down until your brass ejects clean and the action cycles smooth, which matters a lot when you are running different loads or adding a can. Builders pairing it with the recommended bolt carrier group, buffer, and spring report reliable function and tight groups right out of the gate, with some seeing sub-MOA results early on.
Whether you are building a coyote rig, a target gun for ringing steel at distance, or a lightweight medium-game hunter, this barrel gives you a lot of reach in a familiar package. It is American made and carries Odin Works' lifetime repair-or-replace coverage on defects, which is about as much confidence as you can ask for in a barrel.
Beyond the barrel, gas block, and gas tube included here, you'll need a 6mm ARC bolt (which shares the 6.5 Grendel bolt face), 6mm ARC magazines, and an appropriate buffer and spring. Odin Works recommends pairing it with their bolt carrier group along with a carbine spring and H1 buffer for smooth cycling. The rest of your standard AR-15 lower and upper carry right over.
Yes, it ships with a .750 tunable stainless gas block that lets you meter how much gas cycles the action. Builders typically start with it open, then close it down until the rifle runs reliably and brass ejects cleanly, usually around a 90-degree angle. That flexibility is handy when switching loads or adding a suppressor.
The 6mm ARC is the most long-range capable cartridge available on the AR-15 platform, staying supersonic well past 1,000 yards with the right high-BC loads. An 18-inch barrel gives you plenty of velocity for precision work while keeping the rifle handy and lighter than an AR-10. Most practical hunting and target shots land well within that window.
This barrel has a 1:7.5 twist, which is on the fast side and built specifically to stabilize the long, heavy 103 to 108 grain bullets the 6mm ARC is known for. That fast twist is what unlocks the round's flat trajectory and downrange accuracy. It handles common factory match and hunting loads without issue.
| UPC | 850048530515 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | B6MM18ARCRTG |
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