Standard Cap Glock Mags

[SLYoteBoy]

When I first got mine I loaded 10 rounds and had to give it a push to get it seated. I dropped it to check it out it had a nice dent in the brass. Since theyve broken in no longer denting the brass , and a little easier to insert on closed slide.

[GW]

I believe the older mags were not made with metal sides while the newer ones are. The older ones will thus bend and push into the magwell when inserted. Buy some rebuild kits and they will be smooth to insert and drop.

Bingo!
The 1st generation mags "swelled" when fully loaded and didn't drop free as a result. The problem was fixed with steel inserts in newer mags
Rebuild kits will solve the problem
try 44mag.com

[bohoki]

yea all my glock 17 mags and half my glock 21 mags have the U type back of the feed lips one of my glock 17 mags has an issue where i get bolt over on the last round and i notice its follwer doesnt have the little ridge on the center like all my others i guess it is the gen 2 follower and i need a gen 3

[FieldsofFire]

The first few generations of Glock magazines were "NFML" (not fully metal lined). These mags swell slightly when fully loaded. The Austrians didn't want the mags to drop free when fully loaded in case of accidental mag release...and couldn't figure out why the Americans would want to drop a full mag.

Later generations are "FML" (fully metal lined). These like the 10 round mags are much stiffer in construction and will not swell.

I am assuming the notch at the top rear of the magazine is either cut out like a "U" or square notch. The FML mag notch are flat bottomed with tapering sides.

Look a little online and you will find more information. There is a good pic that someone posted of the mags (they are on something like 8th or 9th Gen now)....but you will have to search to find the pic.

Hit the nail on the head.

You can rebuild those magazines legally if you want to make them "drop-free" mags that will not do what you are experiencing.

[Sajedene]

A good tap in should take care of it. But I know what you mean.

[Flying Sig]

See below: