Shop › NCSTAR AR10 UPPER RECEIVER BLOCK NCSTAR AR10 UPPER RECEIVER BLOCK $42.99 NcSTAR AR10 Upper Receiver Block, For use with AR-10, Anodized Finish, Blue VTHAR10UVB Quantity: Add To Cart Added! NcSTAR AR10 Upper Receiver Block, For use with AR-10, Anodized Finish, Blue VTHAR10UVB