The Rock River Arms LAR-15M Rifle (Rock River part no. BLK1700DS) is chambered in .300 AAC Blackout, giving shooters a subsonic- and supersonic-capable cartridge in a proven AR-15 platform. It’s built around a 16-inch threaded barrel with a 1:8 twist rate and an extruded aluminum A4 upper receiver featuring a port door, with no forward assist for a simpler, lighter build. A 15-inch free-float M-LOK handguard opens up plenty of room for accessories, while an RRA single-stage trigger and an A2 flash hider round out a rifle built for serious range use. It ships with a polymer magazine, owner’s manual, and warranty information.

Key Specifications

• Chambered in .300 AAC Blackout for versatile subsonic and supersonic performance.
• Ships with a 30-round magazine.
• 16-inch threaded barrel with a 1:8 twist rate.
• Extruded aluminum A4 upper receiver features a port door for a durable, precise fit.
• Upper has no forward assist, for a simpler, lighter build.
• 15-inch free-float M-LOK handguard opens up room for accessories.
• RRA single-stage trigger provides a consistent, familiar break.
• Equipped with an A2 flash hider to reduce visible muzzle flash.
• Includes a polymer magazine, owner’s manual, and warranty information.

Frequently Asked Questions

What caliber is this rifle chambered in? .300 AAC Blackout.

What trigger does it use? An RRA single-stage trigger.

Does the upper have a forward assist? No, this A4 upper receiver has no forward assist, for a simpler, lighter build.

Buy the Rock River Arms LAR-15M Rifle

Want a .300 Blackout AR-15 built for subsonic and supersonic loads alike? Order this Rock River Arms rifle from our AR rifles lineup and we’ll ship it fast and insured to your local FFL from our Lubbock, Texas shop.