The Ruger AR-15 Stripped Lower Receiver (Ruger part no. 28500) gives builders a durable, forged-aluminum foundation to start or finish their next AR-15 project. Built by Ruger / Sturm, Ruger & Co., a manufacturer with a long track record in both rifles and precision-machined components, this stripped lower is chambered for 5.56/.223 and offers the durability shooters expect from a genuine Ruger receiver. Whether you’re building your first AR or adding another to the collection, this lower gives you a proven, mil-spec-compatible starting point.

Key Specifications

• Chambered for 5.56/.223, the standard AR-15 platform caliber.
• Machined from forged aluminum for durability and long service life.
• Classified as a Stripped Lower Receiver, ready for your choice of fire control group and furniture.
• Manufactured by Ruger / Sturm, Ruger & Co., a trusted name in American firearms.
• Ships at approximately 0.7 lbs.
• Forged from 7075-T6 aluminum and finished with a Type III hardcoat anodized coating for durability.
• Machined to mil-spec tolerances, accepting standard fire control components, grips, and buffer tube assemblies.
• Includes an adjustable tension screw to minimize play between the upper and lower receivers.
• Accepts standard AR-15 upper receivers without additional fitting or modification.

Frequently Asked Questions

Is this a complete or stripped lower receiver? It’s a stripped lower receiver, ready for you to install your own internals and furniture.

What material is it made from? It’s machined from forged aluminum for durability.

Does it include a way to reduce upper/lower play? Yes, it includes an adjustable tension screw to minimize play between the upper and lower receivers.

Buy the Ruger AR-15 Stripped Lower Receiver

Start or finish your next AR-15 build on a durable, forged Ruger foundation. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL as soon as it’s ready to ship, from our Ruger / Sturm, Ruger & Co. lineup of AR15 lowers.