Short version: if it’s not working you installed them wrong. They are very reliable and work very well with Tactical Development base plates (the ones for mag guts), Wilson Combat grips, and the Katana mag well. The 12 plus two needs worked on to fit with the accessories but the 15 plus two is ready to go. This is my 5th mag guts and every one is awesome! I always have to read the instructions to get things installed right but it really is so simple to install. I am always putting the lip off the bottom of the spring in funny so it’s worth the 10 seconds to read and follow the instructions. I use the Tactical Development pro ledge base plates (for mag guts) on my 14 round magazines (12 with plus two) and they really provide a more refined finish to the magazine. The cost adds up and we are looking at a 100 dollar magazine now but for me and my thought processes are that it’s worth those extra two rounds. I installed the Katana mag well on my Wilson Combat grip and had to Dremel of some of the edges from my Tactical Development base plate so they would fit. The mag guts base plates fit right in with the Katana. The 15 plus two we perfect but the 12 plus two kinda got buried in that mag well: that’s why I altered my Tactical Development ones.
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