Glock 20sf failure to feed

[ShoootA]

Brand new gen 3 glock 20sf 10mm.

First 2 mags of 10 rds each ran perfect.

3rd mag of 5 rds failed to feed after firing 2 rounds. It continued to do this the rest of the box of 50rds. Same rd failed to feed with both magazines.

Sig sauer 180gr fmj.

Does it just need to break in? Ammo prob? Mag problem?

Any help is appreciated!

[JTROKS]

Did the breech face catch the round behind the rim or the web case? Brand new gun has stiff recoil spring. The slide nay not be going back far enough and not enough time for the round to come up.

Per Sig's ballistic table 180 grn FMJ 1250 FPS. With my experience in reloading 10mm that should have enough pressure to cycle any factory 10mm pistol. Next time you go to the range try hand cycling those rounds and see how smooth they come up the feed ramp. Try different ammo brand.

[jdigi101]

If your grip while firing is as low as it is in your pic I would say that is the issue. A low grip on a Glock can give a limp wrist effect.

Choke up and see if it makes a difference.

[ShoootA]

Did the breech face catch the round behind the rim or the web case? Brand new gun has stiff recoil spring. The slide nay not be going back far enough and not enough time for the round to come up.

Hmmm, I honestly don't know. The round was still partially in the mag... I should have looked more closely. I'm hoping it just needs more break in. The range I was at doesn't allow 10mm on their steel targets but the RO let me shoot at the backstop just to fire it. So I only went through one box. I need to take it back there when their paper range is open.

I tried my best to make sure I wasn't limp wristing it, especially after the ftf but it is a 10mm lol. My grip was as high as possible while shooting

[Carcassonne]

The G20 doesn't need to be broken-in.
I never had a problem with my G20 and SIG 180 grain loads, even when it was new. I also don't think you can limp wrist a Glock 20. I shoot 40S&W with the stock spring, and never had a problem.

Maybe you installed something wrong - like the recoil spring.
Is the mag spring weak?

.

[SILENT GUNMAN]

Probably the ammo. I had a problem with hpr hollow points when I got mine. Switched to a different brand and it ran fine. Of course mine only did it on the last round. After about 300 rounds it decided it wasn't picky anymore.

[billped]

You tried both mags, so that isn't it. Different ammo and different shooter. That should eliminate issues.

[Kwikvette]

I had this same exact issue last week with my new Glock 26; switched ammo and the problem was gone.

[Port Authority]

You tried both mags, so that isn't it. Different ammo and different shooter. That should eliminate issues.

You should try to help.


***

It's almost always mag springs.

Stronger mag springs (Wolff) will overcome most other imperfect elements.

https://www.gunsprings.com/GLOCK%20%C2%AE/cID1/mID5/dID116#148

Recoil springs, un-poliched breech face and extractor claw have all been causes of feeding issues.

I have the "dreaded" G36 and I've been there and done this.

Flawless ever since two years ago.

I may clean it again next year.

Port.

[dozer wright]

I had the same issue with new G20 5 brand new mags could not figure problem out . Turns out the mags had a piece of plastic left over from the molding process . Every mag had a couple just little tabs . Only reason I found it was took mag apart and pulled the spring it hung up bad .
Little file work and no more problems.This wasn't a consistent issue and was a pain to trouble shoot .

[ShoootA]

Thanks for the input everybody.

I plan to try other ammo and let it break in. If that doesn't work out I'll investigate further.

It's not the grip or the user, the pic isn't an action shot folks...

[jumbopanda]

I had the same problem with my 20SF using five mags from the same batch. I eventually tried new mags and the problem went away.

[ShoootA]

So I finally had a chance to go back to the range...

Different Ammo - armscor 180gr fmj
Same mags and one new mag.

I fired 100 flawless rounds. No hiccups what so ever. I couldn't replicate the problem. I even shot with my weak hand.

Between last range time and this range time I did not clean it or lube it. I dry fired quite a few times and I stored it one night with the slide back. So the only difference this time is the Ammo and that it's been cycled more.

Now that I know its not a magazine or firearm issue I'm curious to go back with the sig ammo and see if I get the feeding problems again...

[jdigi101]

Thanks for the update.

I am interested to see if the Sig ammo will work now.

It sounds like a brief break in period? Enjoy your awesome pistol.

[JTROKS]

Maybe if you bought a 1911 you would've had a flawless, jam free shooting session. Glad it works now.