Exactly what I was looking for
I bought 4 of these for 4 Glock 21 mags. They arrived way sooner than I expected them to. It took about 10 minutes to install all 4 of them and fully load the mags. In my opinion the mags are more secure and stable with these mag extensions than they were originally. The gun cycles perfectly even with the extra 4 rounds in each mag. I am currently using the original mag springs but I just ordered 4 of the recommended mag extension springs to make sure I don't have problems in the future. These mag extensions are exactly what I had been looking for. They are well made, fit perfectly, and make the mags look good too. And because of the way they are made, wearing them in an open top mag pouch is much more comfortable now, the originals have that kind of point because of the angled bottom, but these are flat because of the matching angle where it connects to the magazine. They don't jab into my stomach like the originals used to. I highly recommend these extensions over any others on the market.
