I don't think I will be buying any more.
So, I decided to pick one of these +5 extensions up for a Glock 20 magazine, try it out, as it were. I have +2 extensions on most of my mags (from Lone Wolf), and they are hard to get that 17th round in, but they work, and are cheap. This extension installed very easily, and seems well built, but it simply does not work with my Gen4 magazine. After it feeds 5 rounds, the follower hangs up on the bottom of the original magazine, and the rounds just fall out with no spring pushing them anymore. I have removed significant material rounding the inside of the bottom of the mag, and sanded with 500 grit, until it is super smooth. Still hangs up about a third of the time. I'll probably keep trying to smooth and round some more, and hopefully get it to be at least mostly reliable. For something that costs MORE than a new magazine, I would expect it to actually work out of the bag. This is seriously overpriced for a +10% Wolff spring and three little pieces of plastic. I won't be buying any more of them, and I wouldn't recommend them to anyone.
