The Rock River Arms Light Mountain Rifle in 5.56mm (MPN MT1800) is a semi-automatic AR-15 built to be as light as possible on the trail, pairing a chrome moly lightweight 16-inch barrel with a 1:9 twist rate. Rock River Arms fits an RRA lightweight aluminum Mountain Rifle handguard, a Hogue rubber grip, and an oversized RRA winter trigger guard for use with gloves. The muzzle wears an A2 flash hider, and the rifle feeds from a detachable 20-round magazine. It ships complete with one magazine and an RRA hard case, weighing only 6.2 pounds empty. Among AR-platform rifles in the AR rifles category, the Light Mountain Rifle favors hunters and backcountry shooters who want to shave every ounce.

Key Specifications

• Chambered in .223 Rem/5.56 NATO with a 1:9-inch twist rate.
• Features a chrome moly lightweight 16-inch barrel.
• Includes an RRA lightweight aluminum Mountain Rifle handguard.
• Fitted with a Hogue rubber grip.
• Includes an oversized RRA winter trigger guard.
• Capped with an A2 flash hider.
• Feeds from a detachable 20-round magazine.
• Ships with one magazine and an RRA hard case.
• Weighs only 6.2 pounds empty.

Frequently Asked Questions

How much does this rifle weigh? Only 6.2 pounds empty.

Does this rifle come with a case? Yes, an RRA hard case and one magazine are included.

Buy the Rock River Arms Light Mountain Rifle

Shaving every ounce for the backcountry is exactly what the Light Mountain Rifle delivers. As soon as it is ready to ship, order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.