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The 6mm ARC has quickly earned its reputation as the round that finally lets a standard AR-15 reach out and touch targets at distances once reserved for bigger platforms. This Shaw barrel is built to make the most of it. Every barrel is precision reamed and button rifled, with length and bore diameter held to match-grade tolerances of .0003 inches. It's machined from 416R stainless steel and finished in a non-glare bead blast matte, so you get the accuracy potential of premium stainless without a shiny giveaway on the range or in the field.
The 18-inch length hits the sweet spot for 6mm ARC. It gives you enough tube to wring out solid velocity from the 103 to 108 grain match bullets the cartridge loves, while still keeping the rifle handy enough to carry all day. The 1-7.5 twist with 6-groove rifling is spun to stabilize those long, high-BC projectiles that keep the ARC supersonic well past 1,000 yards. Real-world shooters running 18-inch guns report first-round hits out to 700 yards with recoil that feels a lot closer to a .223 than anything punishing.
The spiral flute isn't just for looks, though it does look sharp. Fluting sheds weight and adds surface area to help the barrel shed heat during longer strings. You're getting an HBAR contour with a .750 gas journal for low-profile gas blocks, a dimpled gas journal to make alignment easier, a rifle-length gas system, and a 5/8-24 muzzle thread that plays nice with common brakes and suppressors.
Headspacing runs on the 6.5 Grendel Type II / ARC spec, so you'll want a matching bolt to complete the build. This is a bare barrel meant for a custom AR-15 project, whether you're putting together a lightweight hunting rig, a DMR-style setup, or a precision plinker that stretches your effective range.
No, this is a bare barrel. It headspaces to the 6.5 Grendel Type II / ARC spec, so you'll need a matching bolt to run it, and a gas block and tube are separate purchases. Shaw offers a Superlative Arms adjustable gas block and stainless tube as an add-on if you'd rather grab it all at once.
It's a 1-7.5 twist with 6-groove rifling. That fast twist is exactly what you want for stabilizing the long, heavy-for-caliber 103 to 108 grain match bullets the 6mm ARC was built around. It's the reason the round stays supersonic and accurate at extended distances.
The 18-inch length is widely considered the sweet spot for the cartridge, balancing velocity with handling. Shooters running similar setups report reliable first-round hits out past 700 yards, and the ARC stays supersonic well beyond 1,000 yards in optimized loads. Your real ceiling comes down to ammo, optics, and practice.
Yes. One of the big draws of the 6mm ARC is that it runs on a standard AR-15 lower and uses standard magazines. You'll need the correct ARC-spec bolt and a compatible upper, but the lower you already own will do the job.
| UPC | 810140170200 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR15HBSSHF186ARC |
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