ACI M4-15 Stripped Lower

The Andro Corp Industries ACI-15 Stripped Lower Receiver delivers a clean, mil-spec foundation for your next AR-15 build. Forged from 7075-T6 aluminum and finished in a Type 3 hard coat anodized black, this serialized lower is precision-machined to accept standard AR-15 components while clearly marked with “Safe” and “Semi” selector positions and multi-caliber engraving.

This ACI-15 lower receiver is ideal for builders who want full control over every part of their rifle or pistol configuration. Its multi-caliber designation supports a wide range of AR-15 chamberings, making it equally at home in a dedicated range gun, training rifle, or general-purpose carbine. With consistent machining and attention to detail, Andro Corp Industries provides a dependable starting point backed by a reputation for solid, no-nonsense AR components.