Rock River Arms 5.56 NATO 10.5" 31-Round Threaded Barrel Carbine

The Rock River Arms 5.56 NATO 10.5" 31-Round Threaded Barrel Carbine (SKU 180261) is a purpose-built platform for tactical professionals, law enforcement, and trained civilians who demand reliable performance in close-quarters and mid-range engagement scenarios. This short-barreled rifle (SBR) configuration delivers the firepower of intermediate rifle rounds in a compact, maneuverable package ideal for vehicle operations, building entries, and dynamic response situations. Rock River Arms has engineered this carbine to meet the exacting standards of users who cannot compromise on reliability or ergonomics when duty or personal security depends on instantaneous mechanical dependability.

The 10.5-inch threaded barrel maximizes velocity retention while maintaining a handling length significantly shorter than full-length rifle variants—critical for tactical mobility without sacrificing terminal ballistics. The threaded muzzle permits direct attachment of sound suppressors or compensators to reduce muzzle signature and manage recoil impulse, features valued in noise-sensitive operations and high-volume engagements. Accepting 31-round magazines, this carbine optimizes ammunition capacity for extended operations or team-based tactical employment. At 8.86 lbs unloaded, the platform balances controlability with durability, enabling prolonged use without fatigue degradation. Rock River Arms' proven direct-impingement operating system and mil-spec component integration ensure consistent round-to-round performance across diverse environmental and operational conditions.

This carbine is ideally suited for operators requiring a compact duty rifle, law enforcement special response teams deploying from vehicles, and trained civilians building a modern sporting rifle platform. Compliance with applicable federal, state, and local firearms regulations—particularly SBR registration where required—remains the purchaser's responsibility. The threaded barrel accepts standard 5.56 NATO suppressors and muzzle devices with 1/2x28 thread pitch, enabling customization for specific mission profiles. Standard AR-15 furniture, rail systems, and optic mounts remain fully compatible, allowing seamless integration of proven aftermarket components and accessories. Purchasers should verify state and local legality before acquisition, as short-barreled rifles are subject to federal registration and restricted in certain jurisdictions.