These just came out, and are hard to find. Will ship within the US for $20 insured.... Pictures to come, limited quantities.
Brand new Ruger Stripped Lower Model 8506.
Item #: 8506
Description: RUG AR-556 LOWER RECEIVER ONLY
Model: AR-556 Lower Receiver
Type: AR Lower: Receiver Only
Caliber: 5.56 NATO|223
Receiver: Black Finish, 7075-T6 Aluminum Lower
Packaging: Cardboard Box