Bushmaster XM15-E2S Lower Receiver

A stripped lower receiver is a bare-bones component that does not include any internal parts like the trigger group, safety selector, or buffer assembly. It provides the essential foundation, allowing you to select and install the specific components that best fit your build requirements.

Yes, this receiver is marked as multi-caliber, meaning it is designed to be compatible with various AR-15 platform calibers. While the lower itself will physically accept different upper assemblies, you must ensure that your chosen barrel, bolt carrier group, and magazines are appropriate for the specific caliber you intend to shoot.

The tension screw is a practical feature that helps eliminate 'wobble' or play between the upper and lower receivers. By tightening this screw against the rear take-down lug of your upper receiver, you can achieve a tighter, more secure fit for improved stability.

7075 aluminum is an aerospace-grade alloy known for its exceptional strength-to-weight ratio and durability. Forging this material aligns the grain structure of the metal, resulting in a receiver that is significantly more resistant to stress and impact than cast or billet alternatives.

Yes, this receiver features a matte black finish. This coating provides a clean, uniform look and adds a layer of protection against corrosion and wear.