I don't know. It didn't have this particular problem before I sent it in the last time. It had other problems . . .
I tried to recreate the issue at home. I loaded up the problem mags with Federal HST 147 grain, locked the slide back, inserted the mag and hit the slide release. I then removed the magazine, racked the slide to remove the round in the chamber, then loaded another round onto the top position of the magazine, locked back the slide, and repeated the process. Within a few rounds I got, a duplicate of the failure to feed I experienced at the range when hitting the slide release with a locked back slide. I had this happen twice within about 10 rounds.
I then did the same thing with about 70 different rounds of some Federal 115 grain JHP without experiencing this problem. The Federal 115 grain JHP is a shorter round with a rounder profile closer to that of FMJ.
Please read the disclaimers after the photos.
Here's a photo that I took of one of the loading malfunctions I experienced at home:
Here's a bad photo of the Federal 115 grain JHP 9BP next to the Federal 147 grain HST. Note the difference in length and profile of the two rounds.
Disclaimer 1: This is one of the few times I've been glad that my Shield has a manual safety and the only time I have used it after first working with the gun and discovering how small, unergonomic, and hard to disengage as part of the drawstroke the safety is.
Disclaimer 2: The above described exercise is generally the type of thing that people describe trying to do at home right before they had an ND. It gets repetitive and all it takes is one lapse of attention and you have an ND. It's not the thing to do while watching television. My late friend Paul Gomez often said that pulling the trigger after you unload the gun is not part of the unloading process.
Disclaimer 3: I did not rechamber the same round. After each chambering I loaded a new round to the top position of the magazine and repeated the process.
Disclaimer 4: Yes, I realize that the Fed 115 grain JHP is an outdated round by today's standards. No, I don't think what I did was a valid function test for anything but feeding the first round from the magazine from a locked back slide when using the slide release. I have about 100 rounds of this ammo and will run it through the gun when I get the chance.
Disclaimer 5: Yes, I've spent way, way too much time on this one gun. Maybe I should send it back to Glock
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