I picked up 5 of the 17 round mags pinned to 10 from a sponsor. There is a definite difference between these and OEM. The first mag, the follower got stuck in the one round loaded position because the edge got caught on some excess plastic moulding around the edge of the mag lips. I subsequently disassembled all 5 mags, and trimmed excess plastic from the mag lips with an Exacto knife. It seems to have fixed the followers from binding near the top. Incidentally, the interior of the mags were quite dirty, with bits of plastic, and small metallic dust in the interior as well. A few passes with my mag brush fixed that. The spring seems to be good quality, not painted as I've seen in some other online reviews. I'm going to see how they work with a genuine Glock follower, as the one KCI includes is fairly flimsy feeling.
I'll update after I've had a chance to try them at the range.
I'll update after I've had a chance to try them at the range.




















































