Found a BT99 Plus but I know nothing about this gun and so far have only seen a couple pictures. I assume the recoil pad screws in out for length of pull but does it absorb recoil as well. And how many adjustments on the rib, would it go say 50/50 all the way to 100% high.Are there notches on the rib like say a MX15 Are these guns reliable? When the hinges wear, get sloppy, can they be rebuilt? Thanks