The Andro Corp ACI-15 Partial M4 Lower Receiver (brand part no. ACI15LBP) is a precision-engineered foundation for a custom AR-15 build from Andro Corp Industries, machined from aluminum and finished in black anodizing. As a partial build, it delivers the core lower components builders need to get started, while leaving the flexibility to add a preferred stock and upper receiver. It accepts any standard mil-spec AR-15 upper, making it compatible with multiple calibers depending on the upper chosen. It suits serious shooters and custom builders who want to hand-select their own furniture and configuration rather than buying a complete rifle.

Key Specifications

• Compatible with multiple calibers, since it accepts any mil-spec AR-15 upper receiver.
• Sold as a partial M4 lower assembly, delivering core lower components while leaving room to add your own stock.
• Machined from aluminum and finished in black anodizing for durability.
• Built as a precision-engineered foundation for custom AR-15 builds.
• Ships with the core lower components installed, leaving the stock and upper to the builder.

Frequently Asked Questions

What does the partial designation mean for this lower receiver? It ships with the core lower components installed but without a stock, letting builders add their own preferred stock and upper receiver.

What calibers is this lower compatible with? It accepts any standard mil-spec AR-15 upper receiver, so it is compatible with multiple calibers.

Buy the Andro Corp ACI-15 Partial M4 Lower Receiver Black Anodized

Start your custom AR-15 build on the Andro Corp ACI-15 Partial M4 Lower Receiver from Schaefer Defense. Browse more lowers and complete builds in our AR-15 lower receivers lineup, then order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.