Rock River Arms LAR-15M BLK2132 300 AAC Blackout 8" 31-Round Rifle

The Rock River Arms LAR-15M BLK2132 in 300 AAC Blackout with an 8-inch barrel represents a purpose-built platform for close-quarters tactical operations, breaching, and precision shooting in suppressed configurations. Designed for law enforcement tactical teams, military personnel, and serious civilian operators, this short-barreled rifle delivers the ballistic efficiency of an intermediate cartridge in a highly maneuverable package. The 300 Blackout caliber was developed specifically for subsonic performance when paired with a suppressor, making this platform ideal for CQB environments where noise signature and flash reduction are operational priorities.

Rock River Arms engineered the LAR-15M platform with precision and reliability that meet mil-spec standards, featuring a modular design that accommodates both supersonic and subsonic ammunition without adjustment. The 8-inch barrel length optimizes velocity for the 300 Blackout round while maintaining a compact overall length of 39.7 inches—critical for vehicle operations, building entries, and confined spaces. At 14.96 pounds loaded with a 31-round magazine, the rifle balances firepower and ergonomic control, allowing operators to maintain target acquisition during dynamic transitions. The M-spec construction ensures durability under sustained suppressed fire and demanding operational cycles.

This configuration benefits tactical teams deploying in urban environments, helicopter insertion scenarios, and situations requiring magazine capacity without excessive weight. The 31-round magazine provides significant firepower advantage while remaining manageable in tactical gear and equipment configurations. Operators planning suppressor integration should note that subsonic ammunition (220–240 grain) delivers superior sound suppression, while supersonic loads maintain extended-range capability when required. The modular AR platform design ensures compatibility with standard AR-15 maintenance protocols, allowing seamless integration into existing armory ecosystems and logistical supply chains.