I just purchased a new 23, traded a Sig P239 for it, I didn't like the idea of a seven round mag. Not to mention the availability of the 40 vs 357sig. Naturally, when I got home, I loaded up the mags. But, just as with my previous 20 and 29, I don't like the way the last bullet going into the magazine pushes so hard against the bottom. And, when you push the fully loaded mag into the gun, you have to press harder than I think we should to seat the mag completely. I have the feeling that putting that last round into a glock mag is going to create problems. Although, of the several hundred rounds that I have put through my glocks, all have fed flawlessly. So what do I do? Is there a good fix for this problem of fully loading a glock mag? Until I hear from you guys I guess I'll keep loading 12 out of 13. It's still 5 more than the P239!