Alexander Arms RTA50ST Tactical 50 Beowulf 7+1 16.50" Threaded Barrel, Black Anodized Receiver w/Picatinny Rail, M-LOK Handguard, Black Synthetic Stock & Black A2 Grip

The Alexander Arms RTA50ST Tactical 50 Beowulf rifle is a specialized large-format carbine built for shooters requiring substantial stopping power and penetration in a semi-automatic platform. Chambered in 50 Beowulf—a wildcat cartridge delivering rifle-class energy from an AR-platform form factor—this rifle combines a 16.50-inch threaded barrel with modular ergonomics designed for tactical deployment and field accuracy. At 9 pounds with a compact overall profile, it bridges the gap between intermediate and full-power rifle capability without requiring NFA paperwork common to larger-bore alternatives.

The RTA50ST features a black anodized receiver with integrated Picatinny rail for optic mounting and accessory attachment. The M-LOK handguard provides modern mounting flexibility for tactical light, foregrip, or sling hardware without the weight penalty of full rail systems. The threaded barrel enables muzzle device installation—critical for 50 Beowulf users managing the cartridge's significant recoil impulse and muzzle signature. Standard Mil-Spec trigger group and A2-pattern grip maintain platform familiarity for shooters trained on standard AR variants. The collapsible stock and black synthetic furniture optimize field handling and allow length-of-pull adjustment across varied shooters and body armor configurations. One magazine is included with the rifle.

This configuration serves specialized applications: long-range hunting of large game where barrier penetration or extreme range is required, precision defense scenarios where intermediate cartridges prove insufficient, or niche competition formats embracing large-bore AR platforms. The 50 Beowulf cartridge's ballistic profile demands a properly tuned firearm; this Alexander Arms factory rifle ensures engineering alignment between barrel, bolt, and ammunition specifications. Operators and enthusiasts seeking 50 Beowulf rifles prioritize manufacturer-matched components over assembly-line AR builds to guarantee reliability with this demanding cartridge.

Alexander Arms is the original designer and ongoing manufacturer of the 50 Beowulf cartridge and purpose-built platforms. The RTA50ST represents their production-standard Tactical model, engineered for field deployment and modular configuration rather than range-only specialization. Buyers integrating 50 Beowulf into an existing AR ecosystem benefit from platform familiarity; the magazine well, controls, and furniture follow AR-15 conventions while chamber and barrel are specifically optimized for this larger cartridge's ballistics.