This vice was designed to make changing barrels so much quicker and easier, particularly if you have a tuner on your barrel.
Many shooters have to completely unscrew the nuts to get the barrel into and out of the vice.
With this one, you just loosen the nuts a bit then slide the rotating stud to the side to easily take out the barrel.
The vice is cnc machined of aluminium, with additional components made from brass and stainless steel. The studs are M12, but either 19mm or 3/4” spanner will fit the nuts.
I made a batch of these for sale, but they are currently out of production.