Rise Stripped Ar 5.56 NATO Rifle

The Rise Armament Stripped AR-15 Lower Receiver in Black (RA-SL-223) is a precision-machined foundation component designed for builders and gunsmiths who demand exacting tolerances and verified quality control. This stripped lower serves as the legally regulated component of a .223 Remington/5.56 NATO semi-automatic platform, compatible with standard AR-15 upper assemblies and stripped receiver builds. Stripped lower receivers represent a critical decision point for operators building custom rifles—material integrity and dimensional accuracy directly impact reliability, accuracy, and long-term durability.

Rise Armament's receiver is manufactured from 7075-T6 aluminum and features mil-spec anodizing in a durable black finish. The ambidextrous configuration supports both left and right-hand operation, a feature increasingly standard in modern tactical platforms where operator flexibility and reduced training burden are priorities. The stripped configuration means this component arrives without trigger group, safety lever, or stock hardware—allowing builders to select components precisely matched to their mission profile. Weight of 0.75 lbs reflects the efficiency of aluminum construction while maintaining the structural rigidity required for semi-automatic centerfire operation.

This lower receiver is essential for builders constructing patrol rifles, designated marksman rifles, or training carbines in the .223/5.56 platform. Law enforcement armorers and military personnel upgrading personal equipment frequently source stripped lowers to build specifications tailored to their specific duty requirements. The .223 Remington/5.56 NATO chamber delivers established ballistic performance, magazine availability, and ammunition supply across domestic and military channels—making platform standardization a significant operational advantage.

As a stripped receiver component, this lower is regulated as a firearm under federal law and requires FFL transfer and background check completion. The ambidextrous design and mil-spec construction position this component within the premium segment of stripped lowers, where consistency and dimensional accuracy justify the investment over commercial alternatives. SKU RISERA-SL-223 and MPN RA-SL-223 identify this exact configuration.