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 :P. 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 ::) 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. >:( 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 >:(.
So after this crap I grab some of the 155 GDHP and put in 3 rounds and WTH they feed with no problem. :o I am looking at my glock in disbelief that it fed. So I grab 3 more rounds and it same it FEEDS. :D. Then get the other mag with new follower and bingo it feeds. Put 4 more in and it feeds them. ;D :D 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
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.
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
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
Lots of Glock feed issues lately. Hope you guys figure it out.
Me too. Oh and its a gen 3.
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.
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.
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!
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 ;D. Accuracy was ok.... not steller but OK. Definately NOT like the AE 180's. They shot LIGHTS OUT!!! :o :o
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. :P
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
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.
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
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?
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.
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
Have you ordered a new slide stop spring yet? Seems like YOndering's post was overlooked, but that is really the first place to look when you have this malfunction regulary, after the position of the thumbs.
Quote from: sqlbullet on June 02 2013 08:56:45 AM MDT
Have you ordered a new slide stop spring yet? Seems like YOndering's post was overlooked, but that is really the first place to look when you have this malfunction regulary, after the position of the thumbs.
The spring is integrated with the stop. If installed incorrectly (in the wrong order), the spring can be damaged/bent. If any of the assembly pins need any more than bare-hand pressure, something isn't lined up. I've had some luck bending weak springs to increase stop pressure (during a diagnostic process), but wouldn't advise it as a permanent solution. It should be replaced. A broken spring would not only exaggerate the problem, but could also cause other failure issues depending on where the broken-off piece ends up. The parts are cheap, just replace them. The majority of the problems I seen have been with the "extended" stop, specifically aftermarket. It could be a matter of increased stop mass, or inferior aftermarket spring manufacturer.
Quote from: sqlbullet on June 02 2013 08:56:45 AM MDT
Have you ordered a new slide stop spring yet? Seems like YOndering's post was overlooked, but that is really the first place to look when you have this malfunction regulary, after the position of the thumbs.
Not yet I have mag springs first then I will give that a try. Heck it cant cost more than a few pennys so I will look one up.
But yeah I guess I did over look that post. I did go over to the glock store and they have the SLIDE LOCK SPRING so I guess that is the same thing. I just don't want to mess things up.
Brian
The are cheap, and that is the spring. Look on Youtube for Glock detail strip videos and watch a few. YOu will get the idea. As DM1906 says, you can do it wrong, but you will know cause you will be forcing something.
Thanks guys. I am ordering it now.
This place is great. Long live the 10mm :P
Brian
I called the glock store and talked to a gock smith and told him of my problems. He actually stated it sounds more like the SLIDE STOP LEVER more than anything. He said if one came into his shop thats where he would start.
I was like ok I just ordered both the slide lock spring and the slide stop lever. Only a couple bucks each so both are on there way.
Will keep you posted
Brian
Sounds good. Hope that takes care of you!
Well so far of my 3 step program. Wolf x10 mag springs was an utter failure. Actually made things worse. Have to go but will be back soon.
Brian
I'm new here and late to "this party"... Sorry to hear about your feeding problem with your Glock 20SF. I would offer (2) suggestions. First, remove the pins associated with your slide lock and the slide lock will be easily removed. Inspect the "spring" on the slide lock, if it is intact, then it "should" still work. Then re-install in this order.... the top pin, then the slide lock lever with the spring below the top pin, and then the larger bottom pin.
You may need to manipulate the slide stop a little as you push the pin in, once it's lined up correctly, the pin should seat pretty easily. It's a common mistake to install the slide stop lever bottom pin first which leads directly to the problem you describe.
If that is not the issue (the slide stop is installed correctly and problem still exists), try disassembling and give your mags a good clean with some Hornady gun cleaner and dry lube.
Your issue sounds to me anyway, to be either the slide stop lever or a magazine issue. I'm new here, but I'm pretty familiar with Glocks.
Hey Ed thanos for your input. Well I got the springs in the mail and put the the new slide stop lever first and tested before the slide lock spring. Well with just the new slide stop inplace it got better much better. Only had about 25 to 30% failure to load that last round in the mag. I just installed the slide slock spring yesterday.
Well I am looking forward to trying out the gun now with both new items installed. Will keep you posted.
Ed I am new to glock as this is my first one so help me understand why the order is important for it to run right?
Also just to clarify the 20sf eats everything I feed it till that last round. Then its kind of a crap shoot if it feeds or not. But with the new slide stop lever its much better. Not perfect yet but better. Just want to make sure you know what I am dealing with.
Brian
The slide stop spring is compressed against the top pin. The bottom pin passes through the slide stop lever. If one places the slide stop in place, then inserts the bottom pin before installing the top pin, then when you do insert the top pin, the "spring" will not be compressed against the top pin.
It seems like a trivial thing, but it causes a lot of new Glock owners much grief, exactly as you describe.
I must have the order right as its getting better. Not perfect but much better.
Thanks Ed
Brian
I'm concerned with your "not perfect, but getting better" comment. It really should be "perfect"... If it were mine, the next step would be to disassemble the magazines, clean the internals of the mags and reassemble paying close attention to the "orientation" of the magazine spring and follower. Look online for a diagram on how they go together.
I use "Hornady gun cleaner and dry lube" spray for this and it works well. If the problem still exists, then replacing the magazine spring would be next. A weak mag spring will lack the tensile strength to lift that last round.
It sounds like a combination of issues. If the slide stop was installed wrong in conjunction with weak mag springs, well, that would be a difficult diagnosis. But if you correct them sequentially, you should be able to eliminate the variables.
Thanks Ed for your help. I tried wolf springs +10 and my issue got WORSE. But I tried this before I changed the slide stop and the slide stop spring. I will check out the mags and see what I can see and. Make sure of reassembly is right with everything you mentioned.
Brian
Brian... I am late to this party. What trigger bar do you have in the gun (does it have the "bumped" striker safety interface?)
My Gen 3 G20SF also started doing exactly what you are describing, it would run fine then lock open with one round left in the magazine. I thought it was my grip but after some testing I figured out that is wasn't. Then I went to magazines, I tried four different ones with the same result. I then removed the slide lock and bent the spring so it had more tension, but at the same time I replaced the trigger bar with a new bumped one after I had screwed up the old one. It stopped doing it but I'm not sure if it was bending the spring or replacing the trigger bar that did it. Just some thoughts.
Rmm its the bumped one. I am looking to go shooting this coming week so with all the things I did I hope it runs right..
But will see
Brian
It's got my curiosity. Hope all ends up solved. Looking forward to the range report.
me too.
Not sure what exactly is going on with the slide locking open on the last round and it not being resolved with new parts, but this sounds like the slide stop for sure. Also, the slide stop has the spring crimped to it, so I'm unsure which two individual parts were being installed previously. I have a feeling the slide lock and spring were installed and not a slide stop. As for the trigger bar with the bump, that's was only to align the bar correctly under the firing pin stop.
I have this slide stop installed on my Glock 20 GEN4 and have zero issues.
http://www.midwayusa.com/product/799965/glock-extended-slide-stop-release-with-spring-glock-17-19-22-23-26-27-31-32-33-34-35-3-pin-model-steel-blue (http://www.midwayusa.com/product/799965/glock-extended-slide-stop-release-with-spring-glock-17-19-22-23-26-27-31-32-33-34-35-3-pin-model-steel-blue)
http://youtu.be/OGd6gnv4ICs (http://youtu.be/OGd6gnv4ICs)
Good insight Ezveedub, and welcome to the forum! 8)
Quote from: Ezveedub on June 26 2013 06:08:16 PM MDT
Not sure what exactly is going on with the slide locking open on the last round and it not being resolved with new parts, but this sounds like the slide stop for sure. Also, the slide stop has the spring crimped to it, so I'm unsure which two individual parts were being installed previously. I have a feeling the slide lock and spring were installed and not a slide stop. As for the trigger bar with the bump, that's was only to align the bar correctly under the firing pin stop.
I have this slide stop installed on my Glock 20 GEN4 and have zero issues.
http://www.midwayusa.com/product/799965/glock-extended-slide-stop-release-with-spring-glock-17-19-22-23-26-27-31-32-33-34-35-3-pin-model-steel-blue (http://www.midwayusa.com/product/799965/glock-extended-slide-stop-release-with-spring-glock-17-19-22-23-26-27-31-32-33-34-35-3-pin-model-steel-blue)
http://youtu.be/OGd6gnv4ICs (http://youtu.be/OGd6gnv4ICs)
I did put a new solide stop and slide lock spring but have not been shooting with all the new parts installed. Been busy with family matters as of late. But I will post when I get out to shoot again.
Thanks for the info.
And a big welcome to the forum