The Rock River Arms LAR-15M Operator DMR (Designated Marksman Rifle) is a precision-focused AR-platform rifle built on RRA's forged 7075-T6 aluminum receiver set with a hard coat anodized finish. The rifle features a premium stainless steel heavy match barrel, RRA's two-stage match trigger with a crisp 4.5-pound break, and a free-floating handguard system for enhanced accuracy. Standard equipment includes an RRA Operator CAR Stock, Hogue rubber grip, RRA Winter Trigger Guard, and a low-profile gas block topped with a full-length MIL-STD 1913 rail for optics mounting. The DMR variant is available in 18" or 20" barrel configurations with a 1:8 twist rate, optimized for accuracy with heavier match-grade ammunition, and features a rifle-length gas system for smooth operation. The rifle is chambered in .223 Wylde, allowing safe use of both .223 Remington and 5.56 NATO ammunition while maintaining match-grade accuracy. Each rifle comes equipped with RRA's Operator muzzle brake, chrome-lined bolt carrier group, and includes one 20-round magazine where legally permitted, all backed by Rock River Arms' accuracy guarantee and lifetime warranty.