ATI Ar-15 Multi Rifle receiver/AR-15 platform component

The ATI AR-15 Multi Caliber Receiver in black is a stripped lower receiver platform component designed for serious shooters and builders who demand precision and reliability. This component serves as the regulated firearm foundation—the serialized lower receiver—upon which you assemble a complete AR-15 platform rifle in your chosen caliber configuration. Law enforcement armorers, military transition shooters, and civilian builders rely on quality lower receivers to ensure proper function and overall structural integrity.

American Tactical Inc's multi-caliber design accommodates .223 Remington and 5.56 NATO, allowing caliber conversion through upper receiver and barrel selection alone. The forged aluminum construction provides the dimensional consistency necessary for reliable bolt closure and hammer/trigger geometry. The black anodized finish resists corrosion and wear in field conditions, ensuring durability during use.

This receiver benefits builders who need modular platform flexibility across multiple calibers without purchasing separate receivers. At 0.63 lbs, the receiver contributes minimal weight to your final build, preserving the balance and handling characteristics critical in tactical or competitive applications. It is compatible with standard AR-15 upper receivers, making it a versatile choice for various shooting applications.