The Ultimate Clip Loader by McFadden Machine is for speed loading Ruger Mk II, III, IV, and 22/45 Magazines. Load the hopper with up to 50 rounds of 22 ammo. Shake the loader to align the shells. Then just slip your magazine into the slot and watch it fill in about 3 seconds. See our Ultimate Clip Loader Video! McFadden recommends Rem Oil to maximize your Clip Loader ammo feed.