Unfortunately, I never got to use mine. When I installed the MI mount, I noticed there was play in the left to right direction, and it didn't snap to a solid center. You could push it one way or the other with your finger, and it would just stay there. I'd bet the slop amounted to about 1 ft at 100 yards, and I didn't bother trying to shoot it since it seemed clearly defective. One other person mentioned this as well, and I just figured they had a bad batch, or a few slipped through QC.
I tried several times to contact MI using their contact form, but never got a reply. I finally called, and they were helpful, but didn't seem to think it was bad. They said to send it back and they'd take a look, so I shipped it back with a letter describing the issue. I was sure it was just a one-off defect, and I asked them to send a new one if they agreed it wasn't normal, or refund the order if they considered that as good as it gets.
It's been almost 2 weeks, and I haven't heard a word, but I just checked my credit card account online and I see that they credited my account a few days after they received it. They certainly don't get any points for communication.
I'll be really interested to hear if other people are seeing the same problem. The design should work, but mine appeared to be machined slightly off, and I was sure they would just send me a good one, but I don't know if they just didn't want to bother with it, or if they're all like that. It's a pity, because I was counting on their mount when I bought the rifle, so now I'll have to come up with a new plan.