From what I have read the MKVI could handle the 45ACP, but even at that I don't shoot off the shelf loads in mine, they are reduced. Since the MKII is not as strong as a MKVI I would load my own 45ACP with a light load and be safe. If I remember correctly I am using a 200 gn laser cast with 4 gns of Unique. Will have to check to make sure.

For $200. I would snap it up.