The NEMO Arms OMEN is a groundbreaking semi-automatic rifle platform that brings the power of magnum cartridges—such as .300 Winchester Magnum and .458 Winchester Magnum—into a precision-engineered AR-style system. Designed for long-range accuracy and tactical versatility, the OMEN series features billet 7075-T6 aluminum receivers, side-charging handles, and fully ambidextrous controls. Its patented recoil-reduction system, including a nickel boron-coated bolt carrier and tuned buffer assembly, significantly mitigates recoil, enabling faster follow-up shots. Models like the OMEN Watchman incorporate a 24-inch Proof Research carbon fiber barrel with a 1:8 twist, delivering sub-MOA accuracy at distances up to 1,800 meters. The rifle includes a 4-position adjustable gas system for optimal performance with or without a suppressor. Additional features encompass a Geissele SSA-E two-stage trigger, Magpul PRS adjustable stock, and a 15-inch M-LOK handguard. Weighing approximately 10.2 pounds and measuring 45.5 inches in length, the OMEN offers exceptional precision and power in a semi-automatic platform.