The new 580 with the tapered barrel and a Nikon Prostaff 3X9X40 BDC scope will do 2" MOA @ 100 yrds. I do it with no modifications yet. So you make the upgrades and might get a more precision rifle. Because I don't compete in shooting competition, I don't care.
If you are trying to get the best precision shooting rifle, don't use the Mini.
There is a point of diminishing return and in my opinion, 1", 2' or 3" MOA means what?
I like the fact that the MINI is a Garand style proven design. It shoots anything you put into it and has the capability to get the job done.
Magazine fed auto-loading rifle is a good thing.