Questions regarding my 20sf issue

445 supermag · May 28 2013 08:13:23 PM MDT

Guys when I first got my Glock 20sf about a month or so ago I took her to the range with a few different loads I had on hand. Win ST PMC ball and something else as I cant remember what it was. Since then I also shot underwoods 180gr TMJ and it also happens with this ammo. But what I noticed was this (and this is where I need your assistance)I could load the magazine with 2, 5, 10, or the full 15 rounds and what is going on is that on the last round I have a FTF. Now before you jump to conclusion let me finish ${$default_tongue_smiley}$ . By FTF its not your normal FTF or maybe its not even the right word for this issue. When I get the second to last round and I fire, the slide locks back like the mag is empty, even though there is one round left. The slide never touches the round ${$default_roll_eyes_smiley}$ just like the it should with an empty mag.

I ordered from the glock store new followers and a third mag incase I got 2 bad ones.

They didn't have any mag springs to try that out as I was thinking a higher LB spring may help.

Went out today to give this a go even though it was raining a bit I still had to try this out. I brought with me Underwoods 180 tmj and their 155gr GD HP. First up is the 180 TMJ with old mag with NEW followers and .... same ol same ol last shot and the slide locks back. ${$default_angry_smiley}$ Try the other old mag with the new follower and same. slide locked back with the last round in the mag. On to the new mag crap same ${$default_angry_smiley}$ .

So after this crap I grab some of the 155 GDHP and put in 3 rounds and WTH they feed with no problem. ${$default_shocked_smiley}$ I am looking at my glock in disbelief that it fed. So I grab 3 more rounds and it same it FEEDS. ${$default_cheesy_smiley}$ . Then get the other mag with new follower and bingo it feeds. Put 4 more in and it feeds them. ${$default_grin_smiley}$ ${$default_cheesy_smiley}$ getting really happy now. Grab the new mag and put 3 rounds in and it eats and is looking for more. THen the rain really came down and I was done.

So now I shot 5 different loads from 4 different companies.

But I only did a few rounds of the 155 GDHP but all feed, but obviously need to put many more down range before I can say they are ok. But still what is causing these issues? Next for me is to change the mag springs as that is all I can think of.

Sorry it got winded but I am at a loss.

Thanks

Brian

4949shooter · May 29 2013 03:49:54 AM MDT

It sounds like you have found the ammo your Glock likes. I would test some more as you have said, and take it from there.

I don't know what could be causing the issues. My G20SF has been finicky, and I have had to tweak it with some heavier recoil spring assemblies.

445 supermag · May 29 2013 06:16:26 AM MDT

4949, thanks for the reply. I forgot to add I have a 22lb brass stacker stainless rod and sping and also a KKM precision barrel of standard length.

Oh and this also happens with the stock barrel and guide rod and spring so I know its not the new stuff.

My thoughts were that glock should be eating just about anything, not just it likes. 4 out of 5 different rounds it wont feed in unacceptable IMHO.

But more tinkering to come.

Brian

445 supermag · May 29 2013 06:18:27 AM MDT

oh and until I hit that last round like likes all ammo and asks for more. So I am going to change the mag springs to see whats going on.

Does anyone know what is the standard spring LB and what to get for a new spring?

Brian

Intercooler · May 29 2013 07:10:11 AM MDT

Lots of Glock feed issues lately. Hope you guys figure it out.

445 supermag · May 29 2013 08:27:31 AM MDT

Me too. Oh and its a gen 3.

sqlbullet · May 29 2013 08:40:44 AM MDT

It seems really likely to me that something is/was engaging the slide stop prematurely.

Now that it is running, have you gone back to the ammo used when you had the problem? It is entirely possible, even likely, that something else changed coincidentally and whatever was causing the slide stop to engage is gone.

If it were mine, I would tear it all the way down and clean and inspect the parts. Glocks aren't hard to detail strip. Then put it back together and try it again.

Also, does the slide stop engage if you load 1 round of the "problem" ammo and pull the slide to the rear and release?

My thoughts.

Yondering · May 29 2013 10:35:52 AM MDT

Weak slide stop spring, and/or your thumb is contacting the slide stop/release lever during recoil. Do you have an oversized slide release installed? Try shooting the gun left handed, see if it still does the same thing. This will help narrow down whether it's you or the gun.

DAVIDF · May 29 2013 03:53:30 PM MDT

445 supermag, I have had the same issues with my Glock 20 Gen 4. See my post regarding those. I contacted Glock & they exchanged magazines. The new magazines worked much better. I still had 1 or 2 times with 1 of the new mags when it locked back when 1 round was left in the mag, but it wasn't constant like before. I've sent the gun back to them today as there were other issues also. So, we'll see if they send a different gun back or fix or not!

445 supermag · May 29 2013 07:57:02 PM MDT

did a quick range trip today. Went to LGS and picked up some anemic AE 180gr for a just to see and add another to the list of rounds I put in my gun.

The 155 GDHP's run with no failures at all. Glock keeps asking for more ${$default_grin_smiley}$ . Accuracy was ok.... not steller but OK. Definately NOT like the AE 180's. They shot LIGHTS OUT!!! ${$default_shocked_smiley}$ ${$default_shocked_smiley}$

AE 180 gr FMJ only 1 time the slide locked back not bad at all. But Dang,,, did that shoot lights out. VERY Accurate. WOW.

Didn't get to shoot my 180 underwood TMJ to see if the hickups started again. I just might have to stay away from UW 180 TMJ and stick with other loads.

Wish I had more time but hey I get to go shoot some more later. ${$default_tongue_smiley}$

I doubt my thumb is hitting the STOCK slide release. It would have to be everytime on the last round and I just can't buy that.

I am going to buy some more factory ammo when I can find it. I hope this was just a break in snafu and things are looking up.

Will keep you all posted.

Brian

DAVIDF · May 30 2013 09:19:12 AM MDT

I've found the American Eagle 180gr FMJ to be very accurate in my Glock as well. However, the Underwood 180 gr TMJ was even better. And the Underwood Delta Lite 180gr FMJ that Intercooler sent me have been the best.

445 supermag · May 30 2013 02:24:28 PM MDT

Interesting David. I mean the 155gdhp at 20 yards with my hands resting on my truck puckup it kept all in a small paperplate. By all means it woukld be adequate for PD But I am a stickler for accuracy and thats why I reload. I just need to get all my components.

Heres to better days with our glocks.

David please keep us posted on the outcome of your situation with glock CS.

Brian

DAVIDF · May 31 2013 02:56:01 PM MDT

Brian, I will certainly keep everyone updated. I dropped it off at the gun shop a couple of days ago for them to ship it back to Glock. Maybe I'll hear something next week?

REDLINE · June 01 2013 05:27:36 PM MDT

Quote from: 445 supermag on May 29 2013 08:27:31 AM MDTMe too. Oh and its a gen 3.

That's the biggest surprise in my mind. The Gen 3 models so rarely have a real issue that it's kinda weird even hearing of it.

445 supermag · June 02 2013 12:22:55 AM MDT

Redline all I can say is that (thats my luck with a 10mm)

Years ago I had a colt delta gold cup and that ended up being the biggest piece of crap I ever had. ( no offence to anyone with one).

I just hope this ends well for me.

I just purchased wolf +10 mag springs so I will see if that helps too.

Brian