Glock 20 Gen 4 Problem

[PandaBear]

Update

I've now tried

15 round factory mag
10 round factory mag
15 round factory mag blocked to 10 rounds
10 round factory mag with Wolff 10% spring

I shoot mostly UW 165 TMJ, but have also tried UW 180 TMJ, UW 150 Nosler, and UW 135 Noslers.

The last round in the mag still fails to feed almost every dang time after a previous round has been cycled.

Completely stock aside from the OEM extended slide release (Glock 20 SF version)

[Oceanbob]

Update

I've now tried

15 round factory mag
10 round factory mag
15 round factory mag blocked to 10 rounds
10 round factory mag with Wolff 10% spring

I shoot mostly UW 165 TMJ, but have also tried UW 180 TMJ, UW 150 Nosler, and UW 135 Noslers.

The last round in the mag still fails to feed almost every dang time after a previous round has been cycled.



Completely stock aside from the OEM extended slide release (Glock 20 SF version)

Bump up the recoil spring to slow the slide down. I suggest a 22 pounder.

Also, perhaps the slide release spring is weak. Swap out a standard slide release to check.

[PandaBear]

I had the same extended slide release as the one in my Glock 19 and then I bought the one specifically for the Glock 20 and I've definitely put less than 100 rounds with it installed.

I will switch it back the the one it came with and give it a try. If that doesn't work, I'll try the 22lb spring from Glockmeister made specifically for Gen 4's.

I appreciate the input.

[SILENT GUNMAN]

I had this same problem with hpr hollow points. It looked like the last round was getting hung up on the bottom of the feed ramp. I called Glock and they wanted me to send in my brand new gun. Before sending it off I decided to polish the feed ramp a little bit with my dremmel and try different ammo. I ended up running about 300 .40s&w loads through it and now it will anything I put in it.

[mulyhuntr]

I had the same issue with my gen 4 g20 and underwood ammo. Installed a 22lb recoil spring and haven't had it happen since.

[Bill Steele]

I had the same issue with my gen 4 g20 and underwood ammo. Installed a 22lb recoil spring and haven't had it happen since.

I run a 22lb RSA on my G20SF to help slow things down with hot loads, but I am not getting how the RSA will effect the premature lock back. In my experience that is always caused by interference of the bullet ogive and the slide lock, or the shooter riding the slide lock up with his/her grip. If anything, I would expect the higher felt recoil with the heavier spring to make any bullet movement forward in the magazine worse.

Not arguing, just thinking out loud.

[PandaBear]

If I was riding the slide release, then how come I haven't had the slide lock back when I have 2 or more rounds left in the mag? I let a RO shoot my 20 (he used to own one) and the slide locked back with 1 round in the mag on his first try.

[tacos3]

I had the same problem on my G19 Gen 3 on 12 of my 13 mags only with defense ammo. It did it with Critical Duty, Defense, PDX1, God Dot, Corbon, everything I had. The edge of the hollow point would jam against the bottom of the feed ramp only on the last round.

I took it to my LGS and had a Glock armorer look at it. Glock sent 12 new followers and the problem was fixed.

Hope this helps.

P.S. My 19 has a Glock extended slide release on it if that makes any difference. I have a buddy whose G19 Gen 4 did the same thing and we took our guns to the LGS at the same time. The followers fixed his issue too.

[PandaBear]

Yes the 9mm 2183 followers are known for being faulty.

I have the 10mm3 followers.

[PowMeow]

Glock 20 Gen 4 FTF Issues

My g19 also Jams and the feed ramp with HP ammo and the 2183 followers

[_TomT_]

Do you guys have any luck getting Glock to send the 9mm/3 followers? Everytime I called them they wanted me to send in the entire pistol and all of the malfunctioning mags.

Fortunately I don't have any problems with mine *knock on wood, its almost like they knew somehow. Maybe I should sound more angry over the phone.

[PowMeow]

Do you guys have any luck getting Glock to send the 9mm/3 followers? Everytime I called them they wanted me to send in the entire pistol and all of the malfunctioning mags.



Fortunately I don't have any problems with mine *knock on wood, its almost like they knew somehow. Maybe I should sound more angry over the phone.

I still haven't tried. From my extensive research guys get the following answers:

-Send us the pistol
-we'll send you replacement 9mm3
-there's nothing wrong with the 2183 followers

I've read that polishing the feed ramp could help, but I'm apprehensive to mess with the barrel.

It's really too bad that glock isn't owning up.

[BunBunGlock29]

I don't have a G20 but I had the same issue with my gen4 G29. In the first dozen mags I ran through it, I had the slide lock back with one remaining round twice. I believe the problem is the follower. If you remove the slide and place a magazine with one round in it, the free play from the magazine catch will let it push the slide stop lever up enough to engage the slide. I substituted .40 cal #8 followers in a couple of mags and even pushing up on the base of the magazine it will not engage the slide stop lever. I don't have my lights set up so i can't get photos so I hope this is a clear enough explanation. All my mags came with 10mm #3 followers so I assume that is current production.

I will not be able to range test this for another month because of work but would appreciate any feedback.

[PandaBear]

Interesting. I might have to order some 10mm2 followers. Anyone know if 10mm2 followers will work with Gen 4 mags?

[Bill Steele]

If I was riding the slide release, then how come I haven't had the slide lock back when I have 2 or more rounds left in the mag? I let a RO shoot my 20 (he used to own one) and the slide locked back with 1 round in the mag on his first try.

Nobody said you were riding the slide, read the whole post, jeez louise.