I own a mini thirty. The thing is an absolute piece of crap. It literally jams at least every other round fired. I hate it. It's not bad as far as accuracy, I can hit a 18x12 target at about 100 yards, but the jamming problem more than nullifies any accuracy it has.
I once sent them an old .22 target pistol which was rusted and jammed. (I actually knew the problem was the magazine but sent it in anyway.)
They fixed it and sent it back in a new box. I could not tell it from a new one except for a place which was particularly badly pitted. They had to grind down enough to remove the rust that there was a very slight loss of contour. Also included a new box and papers.
The cost was $25. That was a few years ago so it may be more now.
The mini-14 and 30 generally have a fine reputation for reliability and a poor one for accuracy.