GC_UPC Odin Works OTR-15 Lower/Upper Set 223 Remington/5.56mm, Tan $425.49 OTR-15-RECEIVER-SET-CT show more like this Free (Except HI/AK) Impact Guns GC_UPC Odin Works OTR-15 Lower/Upper Set Tan for 223 Rem/5.56 NATO $427.99 OTR-15-RECEIVER-SET-CT show more like this 9.99 GrabAGun.com GC_UPC ODIN Works Billet Lower and Upper Receiver Set - Coyote Tan $505.00 OTR-15-RECEIVER-SET-CT show more like this Go Gear Direct