The Bushmaster A2 (brand part no. 00-20012-BLK) is a complete, built AR-15 lower receiver chambered in 223 Remington/5.56 NATO and ready to accept a standard mil-spec upper. Built to the classic A2 configuration, it ships fully assembled with a 30-round aluminum magazine included, so there’s no separate parts kit or magazine to source before pairing an upper. Bushmaster’s decades of AR-pattern manufacturing experience back this straightforward, ready-to-build lower. It’s a solid pick for builders who want a proven name and a magazine in the box.

Key Specifications

• Sold as a complete, built lower, ready to accept a standard AR-15 upper.
• Chambered in 223 Remington/5.56 NATO, the standard AR-15 chambering pair.
• Includes a 30-round aluminum BFI magazine, so you’re ready to load and go.
• Includes a manual safety selector for on-safe carry between strings of fire.
• Ships at approximately 3.44 pounds, reflecting the fully built receiver assembly.
• Built to the classic A2 configuration in Bushmaster’s lineup.
• Fitted with a fixed A2 buttstock rather than a collapsible design.
• Equipped with an A2 pistol grip and a mil-spec trigger.
• Includes a mil-spec safety selector for reliable on-safe carry.

Frequently Asked Questions

Does this lower include a magazine? Yes, a 30-round aluminum BFI magazine ships with the unit.

Is this a stripped or complete lower? It’s a complete, built lower receiver ready to accept a standard AR-15 upper.

Buy the Bushmaster A2 Complete Built Lower Receiver

Skip the parts-kit assembly with this ready-to-build Bushmaster A2 lower, part of our AR15 lowers selection. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.