New Lower receiver vise block

[Old Bob]

I've used mine for both traditional castle nuts & the ratchet type nut/plate for carbine buffer tubes. Didn't notice buffer tubes being out of alignment. The thumb screw under the rear clamp can be adjusted to even things out. The rear clamp doesn't have to be real tight either. Finger tight on the thumb screws is sufficient. I've also used it to install rifle buffer tubes. Torqued the buffer tubes to 35 ft lbs easily. Don't even need the clamp. Wish I had one of these years ago...