These mags fit awesome in the Polymer 80 and lock in place very snugly. Have not used them at the range yet, but they seem to function absolutely fine. No idea on longevity but they seem very sturdy.

Well made ,exceeded my expectations , and great price

Im happy with the mags so far. I run a G-17 mag in a g-19,g-26,g-17, and an ar9. They have ran flawlessly. In my opinion, they are no different than an oem mag. Only difference is the baseplate dont say glock. They have the same metal liner and follower as far as i can tell. Half the price.

excellent price

This is just as good as OEM as you can get without the price. Strong body with strong mag springs. Should last just as long as original ones.

I was a little skeptical at first so I bought just two to try out. These mags work and look just like OEM ones !!!! I have since bought the 17 rounders also.......they work great also. Couldn't be be more pleased with 15 and 17 rounders. Can't comment on any others. Try the above mentioned ones and you won't be disappointed !!!

The KCI mags are well made, a great fit in my G17, with same flawless functionality as the Glock OEM

Works without flaws drops free and everything and the price come on how could you no get a couple.