swissFREE SHIPPING COMPLETE A frame front sight block, taken off Colt flat top carbine 6921. I can add these on if you ask : Triangle / circle front cap, gas tube pin, delta ring barrel available… It is F marked, so 1.016 mm higher than non F Marked. Originally for FLAT TOP uppers but CAN be used with built in carry handle upper too, because 1.016 mm is only about 6 clicks higher (so the difference for carry handle uppers can easily be made up by adjusting the front sight, this is mostly important for if you are building something that you want to be "clone correct". $30 each with FREE SHIPPING. Prefer cash will trade for vector picatinny hand stop
