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This is the barrel that turns a standard AR-15 into a legitimate long-range and hunting rig. Shaw builds it around the 6mm ARC, Hornady's answer for shooters who want flatter trajectories and more reach than a 5.56 without stepping up to a heavier AR-10. The 18-inch length has become the go-to for this cartridge because it hits the sweet spot between velocity, weight, and how the rifle handles in the field. You get real long-range capability in a package that still balances well when you're carrying it.
E.R. Shaw has been making barrels in Pennsylvania since the early 1900s, and their reputation with gunsmiths and custom builders is earned. This one is precision reamed and button rifled from 416R stainless steel, with length and bore diameter held to tight tolerances. The HBAR (heavy barrel) contour helps manage heat during longer strings, which matters when you're running the cartridge for varmints, target work, or a full day at the range.
The 1-7.5 twist is exactly what Hornady recommends for stabilizing the long, heavy-for-caliber bullets in the 103 to 108 grain range that make the 6mm ARC shine downrange. It carries a .750-inch gas journal for low-profile gas blocks and a 5/8-24 threaded muzzle for your choice of brake, flash hider, or suppressor. The matte stainless finish keeps glare down out in the sun.
One thing worth knowing up front: converting an AR-15 to 6mm ARC takes a new barrel, a 6.5 Grendel bolt, and 6.5 Grendel magazines. The cartridge shares that bolt face and mag footprint, so the swap is straightforward. Once it's together, this setup handles everything from prairie dogs and coyotes to deer and antelope, plus long-range steel well past 1,000 yards with the right load. It's a versatile, do-it-all barrel for folks who want one AR to cover a lot of ground.
Along with the barrel, you'll need a 6.5 Grendel bolt and 6.5 Grendel magazines since the 6mm ARC shares that bolt face and magazine footprint. The barrel uses a .750-inch gas journal for a low-profile gas block. Once those three parts are in place, the conversion is a straightforward build on a standard AR-15 upper.
The 1-7.5 twist is the rate Hornady recommends for the 6mm ARC to stabilize the long, heavy-for-caliber bullets in the 103 to 108 grain range. Those heavier match bullets carry high ballistic coefficients, which is what gives the cartridge its flat trajectory and long-range reach. This twist keeps them stable across a wide range of temperatures and elevations.
It's widely considered the sweet spot for this cartridge. The 18-inch length balances velocity, rifle weight, and handling better than longer or shorter options for most uses. You get real long-range performance while keeping the rifle maneuverable in the field.
This is a true do-it-all barrel. Hunters use the 6mm ARC on deer, antelope, coyotes, and varmints, while target shooters run it out past 1,000 yards with quality ammo. It gives you noticeably more range and punch than 5.56 without the added recoil and weight of an AR-10.
| UPC | 810140170187 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR15HBSS186ARC |
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