Shop › NCSTAR AR-15 UPPER RECEIVER BLOCK NCSTAR AR-15 UPPER RECEIVER BLOCK $42.99 sold out NcSTAR AR15 Upper Receiver Block, For use with AR-15, Anodized Finish, Blue VTARUVB Sold Out Added! NcSTAR AR15 Upper Receiver Block, For use with AR-15, Anodized Finish, Blue VTARUVB