Kenscot,
I have one in 22 LR. It's very accurate and I love the accu-trigger. In my opinion the main weakness of the Mk II, at the least the ones in 22 LR, is the magazine. When I got my rifle, at first it would jam all the time when closing the bolt. I believe the angle of the magazine (in relation to the chamber) was a bit off. I bent the bracket that holds the magazine a tiny bit, and looks like that fixed the jamming problem. But there was another problem with the magazine itself. Sometimes when opening the bolt one or more rounds would jump out of the magazine. I fixed that by tweaking the lips of the magazine, closing them a little so that they would grip the rounds better. I also purchased a spare 10-round magazine, and it is good, didn't need any tweaking.
At first I got quite disappointed with the feeding and magazine problems. But since fixing the problems, I have fired over a thousand rounds, and am very happy with the rifle.
Marc