The Shield Arms SA-15 complete lower receiver (part no. SA-SA15FB) gives builders a ready-to-run AR-15 lower finished in black anodized aluminum, chambered for .223 Remington/5.56 NATO on a multi-caliber platform. Rather than shipping bare, this lower arrives assembled with B5 Systems Bravo furniture already installed, cutting down on the parts and labor needed to finish an AR-15 build. It is a straightforward option for shooters who want a complete, semi-auto lower ready to accept an upper receiver.

Key Specifications

• Chambered for .223 Remington/5.56 NATO on a multi-caliber receiver platform.
• Sold as a complete lower receiver rather than a bare stripped unit, saving assembly time.
• Finished in black anodized aluminum for a durable, mil-spec appearance.
• Fitted with B5 Systems Bravo furniture for a mil-spec ergonomic grip and stock interface.
• Runs a semi-auto action, firing one round per trigger pull with standard AR-15 components.
• Ships at a 3.0-pound shipping weight as a fully assembled lower.
• Features a patented integrated folding mechanism built into the receiver itself, not a bolt-on adapter.
• The folding design saves roughly half a pound compared to adapter-based folding lowers.
• Uses an H2-weight proprietary buffer matched to the folding system.

Frequently Asked Questions

Does this lower ship complete or stripped? It ships complete, with B5 Systems Bravo furniture and internal parts already installed.

What caliber is this lower built for? It is chambered for the .223 Remington/5.56 NATO family on a multi-caliber platform.

Will this accept a standard AR-15 upper receiver? Yes, it is built to standard AR-15 dimensions and accepts any compatible upper receiver.

Buy the Shield Arms SA-15 Complete Lower Receiver

Order this Shield Arms SA-15 complete lower receiver from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and get a ready-to-run lower without sourcing separate parts. Browse our full selection of AR15 lower receivers for more build options.