G27 with 13rd and 15rd mags, FAIL

[rem44m]

I'm hoping some out there have specific experience with my dilemma. My G27 fails to feed every now and again with G23 and G22 mags. From what I can tell by reading online, my pinky is putting pressure on the magazine in a rearward fashion, causing the round to "nose dive" into the feed ramp. I'm pretty sure that this is the problem because my 9 round and even 10rd pearce grip extension mags do not have any failures/problems at all. Just the 13 and 15 rd mags.

My question is, would an x-grip or other grip adapter fix this problem?

 

[Bovice]

I had a G26 that would shoot just fine with the 17 round mags from my 17. I never used an adapter.

 

[[email protected]]

Have you noticed which rounds fail to feed in the mag? Also how old is the recoil spring in the gun and how old is the mags? My 27 would have an occasional failure to feed when I used my G22 mags from my Gen 3 (2005 era) Glock 22. We were finally approved to use a TLR1 light on our duty weapons, and my G22 would fail to feed with the factory supplied mags. Both gun have been shot alot by me. New mags with the 11 coil sping fixed the issue with both weapons. If the failure is reliable, make sure you are not putting pressure with your pinky. If it still jams then look at the mag and recoil springs.

 

[mongo356]

1st Mag springs

2nd May not hurt to check Recoil spring as well, I put this second because the recoil springs usually last pretty well in the mini & Gen4 Glocks.

To put into a crude simple example:

The fast slide speed of the mini Glocks requires the mag spring push the next round up faster than the longer slower slide brethren. Also if you are shooting the heavier grain bullets (180) it's that much more work.

If the mag doesn't push the next round up in time the slide will catch it before it hits the top of mag lips and push the round forward hitting the feed ramp.

I have never used a grip filler/adaptors and I grip the mag for all it's worth, putting I'm sure tons of pressure on it.

The G22 W/tac light failures are very similar. The metal light (TLR1) stiffened the frame allowing the slide to travel faster under recoil. Hence the 11coil springs. You never heard of many failures using the polymer Glock light or M3 lights, it wasn't till the aluminum TLR's and Surefires that it seemed to surface.

 

[rem44m]

Hmmm... there's some food for though. I will check my mag springs. I know it is not the recoil spring because I replaced that about 6 months ago and haven't put more than 200-300 rounds through it since then.

The mags are "newer" mags, like 2-3 years old. They haven't been used much but I will try some new springs and see if that helps.

With a couple of the failures the slide had locked back, all I had to do was push the slide release down and keep shooting. I made for certain that my thumb was not hitting the slide release.

So to be clear, a couple of failures were "nose dives" and a couple were the slide locking back.

Any thoughts with the slide release? I'm know it wasn't my thumb the second time it happened because I held the gun so my thumb was not in proximity of the slide release.

 

[mongo356]

Has the slide release (slide stop in Glock speak) been removed recently. the spring must be under the top pin to have tension and work correctly. Easy way to check is with an empty gun hold the slide to the rear and you should be able to lift it with your thumb and it should return with some spring tension.

Otherwise sometimes you can still hit it under recoil even though you don't think you are not. Make super double secret squirrel sure your not hitting by accident.

I had a 10mm one time that with very hot 10mm ammo the recoil alone was severe enough to overcome the spring tension and lock the slide back. I changed the slide stop and it still would happen with hot ammo, milder stuff it would never occur.

Just some thoughts........

 

[FireInCairo]

I've run extended mags in a G27 without the grip extension with no issues in the past.

It sounds like you've got a picky gun, but maybe the extensions will eliminate the issue. It's a cheap fix if it does.

 

[GLOOB]

AFAIK, the G27 is NOT guaranteed to work with 13 and 15 rd mags, and Glock will tell you the same.

With the right ammo, the G27 cycles faster than any other Glock.

The standard 9 rd mag uses the same length spring as a 13 rd mag. It moves the cartridges faster than you can get out of a 13 or 15 round magazine.

Regarding slide locking back, try shooting left handed. I suspect your thumb, regardless of how you think you're holding it.

 

[rem44m]

Next time I'm at the range I'm going to try shooting left handed with the 15 rd mag and see if that changes anything. I didn't know/think about the 27 slide cycling faster, I am now starting to think that the magazine is not always able to push a round up quick enough. I appreciate the help guys!