It's all in how it's loaded
First, let me say that the build quality of these magazines is excellent, while not quite up to the standard of the factory originals. By that, I mean that the feed lips are constructed slightly differently on the Triple-K, and the feed lip area hadn't been dipped in cyanide the way the factory originals are (thus why the factory originals have no bluing on this spot on the magazine) to harden this part of the magazine body. With that said, I had good luck using the Triple-K at the range side-by-side with the factory original magazine, with a few hiccups here and there with the Triple-K until I understood how best to load it, then getting much better reliability with it. Because the factory original is constructed slightly differently at the feeding section, it's necessary to load the Triple-K in a slightly different manner to ensure that the cartridges slide into the magazine at exactly the same angle as the follower to prevent binding and misfeeds. I don't think that these aftermarket magazines are lesser quality as such, but they seem to work much better when the cartridges are slid into the feeding area by sliding instead of just dropping in, and a bit of a break-in period seems to get them working better, as I noticed after three times of firing a full magazine through my Sport King. One other item that I would strongly suggest for both the Triple-K and the factory original magazine is the Maglula X10 and V10 magazine loader. Loading this and other magazines for .22LR pistols (the Ruger MK series, for one) that have a side button for loading is considerably easier and much less painful with the Maglula loader. The Maglula comes as a combination of loading tools, the V10 with a spring-loaded system that keeps itself locked in any position on the magazine body, and the X10 consisting of only a single piece of reinforced plastic that slides up and down the body to compress the follower and greatly ease loading. Interestingly, I found that the V10 loader works well on the factory original magazine, while the X10 is by far the better choice for the Triple-K magazine because it much better ensures that the cartridges go in at the proper angle, and it works just as well for the factory original magazine.
