Does just what it needs to do! Worked great as far as I am concerned. My Mp7 needed one serious shim job, now it shoots awesome (with the help of some other upgrades (That were not available here))
I'm being a bit critical here, I mean they're shims... nothing more than precision made washers, but me being a machinist I just had to gage the accuracy of the shim by measuring them. they are very consistent in thickness but some have a .003" lip on the inside hole. it may not seem like much, its only as thick as a human hair, but it can make a small difference.