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The Rock River Arms LAR-15M All Terrain Hunter takes the guesswork out of building an accurate AR-15. It arrives as a complete upper, meaning the receiver, barrel, handguard, bolt carrier group, and charging handle are all assembled and ready to drop onto a mil-spec lower. The heart of it is an 18-inch heavy match stainless steel barrel with a 1:8 twist, cryogenically treated to relieve internal stress and help keep groups tight even as the barrel warms up during a longer sit or a busy range day.
The Wylde chamber is the smart middle ground between a tight .223 Remington chamber and a looser 5.56 NATO one. It blends the leade angle of the 5.56 with the tighter freebore of the .223, so you get the safety and reliability to run hotter 5.56 loads while still squeezing out the precision that match .223 ammo is known for. In plain terms, you can feed it inexpensive 5.56 for plinking and switch to heavier match .223 when you want your best groups, all without swapping barrels. That 1:8 twist stabilizes a wide range of bullet weights, which makes it a genuinely flexible setup for coyotes, hogs, varmints, or paper.
Rock River wraps the barrel in a 13-inch extended lightweight free-float M-LOK rail. Free-floating means nothing but the receiver touches the barrel, which pays off in consistency, and the M-LOK slots give you clean mounting for a bipod, sling stud, light, or hand stop. A low-profile gas block keeps the front end sleek so it tucks neatly under the handguard, and the RRA Operator muzzle brake with 1/2×28 threads tames muzzle rise for faster follow-up shots.
Built on a forged A4 upper receiver with a black finish, this one has the bones of a rifle you can lean on season after season. Pair it with a quality lower, throw a scope on top, and you've got a shooter that earns its keep in the field and on the bench.
It ships as a complete upper with the barrel, handguard, gas system, bolt carrier group, and charging handle already installed. All you need to add is a compatible mil-spec AR-15 lower receiver, then optics or iron sights of your choice. Once it's pinned to a lower, you're ready to head to the range.
Yes. The .223 Wylde chamber is specifically designed to safely fire both 5.56 NATO and .223 Remington ammunition. You get the reliability to run hotter 5.56 loads and the tighter tolerances that help .223 match ammo deliver excellent accuracy, so you can pick your ammo based on the job at hand.
A 1:8 twist is one of the most versatile options for the AR-15 platform, stabilizing a broad range of bullet weights from lighter 55-grain varmint loads up to heavier 69 to 77-grain match projectiles. That flexibility is a big reason this upper works well for everything from varmints to precision paper punching. If you like experimenting with different loads, the 1:8 gives you room to do it.
It will. The 13-inch free float rail uses the M-LOK mounting system, which accepts a wide selection of bipod adapters, sling mounts, lights, and hand stops. Because it's free-floating, adding weight or pressure to the handguard won't affect barrel harmonics, so your accuracy stays consistent.
| UPC | 842834101139 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR0598.V1 |
| Action | |
| Barrel Finish | Stainless Steel |
| Barrel Length | 18" |
| Caliber/Gauge | .223 Wylde |
| Product Type | Complete |
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