Yes, it’s for the rockchucker. There’s lots of other options but I’m not sure for what, I just used it for the rockchucker. It just makes it easier to set the press up on any workbench.
Criterion 6.5 Creedmoor light varmint contour, savage small shank prefit. 24” 1:8 twist. 5/8x24 muzzle threads. About 300 rounds down the tube. $200 ftf in North Idaho.