I just put a set of Warne QD Maxima rings on my performance center Smith 460. The Perf. Center models have built in Picatinny rail. Though it might be nice say while pig hunting to be able to take the scope off and on in a hurry. Only thing that strikes me is I am worried they will easily work thier way loose. Anyone else try them. I also have the permanant attached ones in case these don't work.