Not so hot - Trinity Force AR15 Upper Vise Block

Had to modify the block for the reciever I was working on. Used a saw to cut out plastic that was in my way. I guess it would be fine for a standard upper reciever but not for any modified reciever. Also had issues due to the lack of a hinge holding the two components together. It's difficult to hold 1) the left vice block 2) the right vice block 3) the reciever, and 4) operate the vice screw. On my next build I will buy a block with a hinge.