okay, I have a Ken Farrel 20 moa base, which is Picatinny, who makes true Picatinny rings? I heard that Leupold changed the Mark 4's and they are now weaver, not straight picatinny. is everything burris makes weaver style? I had Weaver rings on the base, and they moved on me, so I want true Picatinny now, it is on a 338-300 ultra as far as recoil goes, with a break. thanks for responses in advance.