Description
Ruger’s 28500 AR-15 stripped lower receiver is a starting point for building or upgrading a rifle. It is machined from 7075-T6 forged aluminum and uses mil-spec tolerances, with features intended to support a precise upper-and-lower fit.
Key Specifications
- The AR-15 stripped lower receiver provides the foundation for a compatible rifle build.
- 7075-T6 forged aluminum offers a durable material for the receiver.
- Mil-spec tolerances support consistent fit between compatible upper and lower receivers.
- An adjustable tension screw helps minimize or eliminate play between the upper and lower receivers.
- The broached magazine well supports the receiver’s intended AR-15 configuration.
- A full-cut inlet fire control pocket is included for the stripped configuration.
- The 5.56/.223 designation identifies the listed chambering compatibility.
- The black anodized finish provides the listed surface treatment and color.
This lower receiver suits builders who want a Ruger foundation for an AR-15 project, with forged aluminum construction and an adjustable tension screw included in the design.



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