Last night I watched "Ruger - Inside and Out". No doubt, Scott Rupp's segment on NSSF (formerly Ruger) Rimfire Challenge was a rerun but it was the first time I had seen it. In his discussion of what one needs for the range he showed some yellow (plastic?) magazine pistol base plates for Mark-series pistols. Anyone know where they can be found? He also showed a loader for 10/22 magazines. It looks to be the Champion version? Anyone have experience with 'em? I have a McFadden Speedloader that works extremely well for my MkII 22/45 and MkIII Hunter (my primary shooters for rimfire steel challenge). Any advice, recommendations and reviews will be warmly welcomed.