Having a problem with Glock (pictures added!)

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Deepriver

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I'll say up front, this is my first Glock, so my experience is limited.

I bought a G23, gen 2 lower from a member. It was already assembled. I then bought a Rock slide with an upper parts kit, installed by them. I have a couple of different barrels, but went with an aftermarket barrel (supposed to be one of the better ones, can't think of the brand at the moment) that I bought from a member. It is a gen 4 barrel, but looks dimensionally identical to the gen 2. I used the recoil spring supplied by the Rock Slide guys.

Out of 10 rounds, 4 of them did not feed correctly and jammed.

Thoughts on what the culprit is?

thanks.
 
Deepriver said:
I'll say up front, this is my first Glock, so my experience is limited.

I bought a G23, gen 2 lower from a member. It was already assembled. I then bought a Rock slide with an upper parts kit, installed by them. I have a couple of different barrels, but went with an aftermarket barrel (supposed to be one of the better ones, can't think of the brand at the moment) that I bought from a member. It is a gen 4 barrel, but looks dimensionally identical to the gen 2. I used the recoil spring supplied by the Rock Slide guys.

Out of 10 rounds, 4 of them did not feed correctly and jammed.

Thoughts on what the culprit is?

thanks.
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Can you post pics with it disassembled?
Will it run through a mag of rounds when cycling by hand?
What caliber? I’ve got a G23 Gen 3 and a Lone Wolf aftermarket barrel. You can swing by and we might be able to compare them & spot the issue.
 
There are several different possibilities. One , which you did not include is the magazines. What pound recoil spring? Is it a two or one piece recoil spring? What magazines are you using and are they new or used?


Sent from my iPhone using Tapatalk
 
Ok. 40 S&W, FMJ w/flat nose. New Glock 13 round mag. Don't know spring rate, but one piece. Storm Lake barrel - used.
Get Off My Lawn said:
Can you post pics with it disassembled?
Will it run through a mag of rounds when cycling by hand?
What caliber? I’ve got a G23 Gen 3 and a Lone Wolf aftermarket barrel. You can swing by and we might be able to compare them & spot the issue.
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If I can't solve the problem here, I may take you up on that... thanks.
 
Glen T said:
Glock barrels are NOT interchangeable across all generations. Some barrels will fit gen 1-3 while gen 4 and gen 5 are separate designs.
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I looked for this information and could not find an answer. But I did measure a Gen2 against this (I was told) Gen 4 and there was no difference...
 
I believe the radius cut on the Gen 4 barrels for the recoil spring assembly is wider/larger to accommodate the dual spring configuration. So a Gen 3 barrel (narrow cut) with a Gen 4 dual spring assembly (large diameter) would have a fit issue (as in does not). With a Gen 4 barrel (wide cut) and a Gen 3 spring (small diameter), there could be excessive play in the fit. Whether or not this is a factor in the "jams" remains to be seen. Many variables since it was not a known working gun from the start and after market parts are involved. Glocks are not always as plug and play as some would have you believe.

What kind of "jams"? Does the slide pick up the round from behind the rim as normal? Is the round partially in the chamber or is it stovepiped? Does the slide impact the middle of the casing? Does the fired casing eject fully? A photo would help a lot.
 
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Put the original slide and barrel back on the frame. Will it run? My guess is, yes, it will run. If the answer is no, I'll suspect limp wristing.
I've seen and used the Rock Slide uppers before and, in my opinion, they are not the best quality aftermarket parts for a Glock. My money says there's where your problem lies.
 
Glen T said:
Glock barrels are NOT interchangeable across all generations. Some barrels will fit gen 1-3 while gen 4 and gen 5 are separate designs.
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This is true for Glock 17 barrels, but Glock 19 barrels should be the same across the generations.
 
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georgel said:
I believe the radius cut on the Gen 4 barrels for the recoil spring assembly is wider/larger to accommodate the dual spring configuration. So a Gen 3 barrel (narrow cut) with a Gen 4 dual spring assembly (large diameter) would have a fit issue (as in does not). With a Gen 4 barrel (wide cut) and a Gen 3 spring (small diameter), there could be excessive play in the fit. Whether or not this is a factor in the "jams" remains to be seen. Many variables since it was not a known working gun from the start and after market parts are involved. Glocks are not always as plug and play as some would have you believe.

What kind of "jams"? Does the slide pick up the round from behind the rim as normal? Is the round partially in the chamber or is it stovepiped? Does the slide impact the middle of the casing? Does the fired casing eject fully? A photo would help a lot.
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The recoil spring has no interaction with the barrel once it is assembled. The recoil spring bottoms out against the front of the slide stop. The barrel is held behind the slide stop.
 
georgel said:
I believe the radius cut on the Gen 4 barrels for the recoil spring assembly is wider/larger to accommodate the dual spring configuration. So a Gen 3 barrel (narrow cut) with a Gen 4 dual spring assembly (large diameter) would have a fit issue (as in does not). With a Gen 4 barrel (wide cut) and a Gen 3 spring (small diameter), there could be excessive play in the fit. Whether or not this is a factor in the "jams" remains to be seen. Many variables since it was not a known working gun from the start and after market parts are involved. Glocks are not always as plug and play as some would have you believe.

What kind of "jams"? Does the slide pick up the round from behind the rim as normal? Is the round partially in the chamber or is it stovepiped? Does the slide impact the middle of the casing? Does the fired casing eject fully? A photo would help a lot.
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I have stuff going on today. I will taken a closer look tomorrow and take a couple of pictures.
Geezer said:
Put the original slide and barrel back on the frame. Will it run? My guess is, yes, it will run. If the answer is no, I'll suspect limp wristing.
I've seen and used the Rock Slide uppers before and, in my opinion, they are not the best quality aftermarket parts for a Glock. My money says there's where your problem lies.
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I don't have the original slide...
 
As a side note, when I look at aftermarket barrels for a G23, none of the manufacturers specify a "generation" compatibility - as if it doesn't matter...
 
So, I swapped out the barrels and put in a gen2 - same thing happening. The black barrel is the Gen2.
 

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Factory ammo? It almost looks like the slide is short stroking and not catching the rim to feed it up into the chamber.

I forget what it is called but the thing that catches the round off the mag looks angled on your gun. Mine looks square.

IMG_20210310_161256279.jpg
 
I have read of many issues with Rock Slides, as I was looking into them for my G26 build, but after reading that I went a different direction. There were many rumblings of QC issues, cracking, and overall coating issues, but this is a different one that I have seen.

I know you do not have the original slide, but do you have a buddy you can borrow a slide from and see if it works?
 
Cameronswmp9 said:
I have read of many issues with Rock Slides, as I was looking into them for my G26 build, but after reading that I went a different direction. There were many rumblings of QC issues, cracking, and overall coating issues, but this is a different one that I have seen.

I know you do not have the original slide, but do you have a buddy you can borrow a slide from and see if it works?
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That's a great idea, but no I don't have any Glock friends. I am the oddball in the crowd...If I decide to invest more $ into this thing, what might be a good slide to try, other than the obvious one, Glock?
teamglock2002 said:
Glock Haters in 3 2 1
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Thank you sir...
 
Deepriver said:
That's a great idea, but no I don't have any Glock friends. I am the oddball in the crowd...If I decide to invest more $ into this thing, what might be a good slide to try, other than the obvious one, Glock?

Thank you sir...
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If you're by the Haw, I think I'm a mile away with a G23, and have a place to shoot.
 
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Get Off My Lawn said:
If you're by the Haw, I think I'm a mile away with a G23, and have a place to shoot.
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I'm back behind Haywood. we've got a place on the Deep River - a few hundred yards up river from mermaids point... I too have a place to shoot. I'm pretty much free anytime. Maybe you can message me some times you might be available over the next few days. thanks.
 
Deepriver said:
That's a great idea, but no I don't have any Glock friends. I am the oddball in the crowd...If I decide to invest more $ into this thing, what might be a good slide to try, other than the obvious one, Glock?

Thank you sir...
Click to expand...

There are more out there for 9mm than .40, I did a quick search and there are a few out there from Suarez, but I think they are bare slides (parts kits pretty readily available, and I think they are the same, save recoil springs (however, don't quote me on that as I am not 100% sure on this) and possibly Lone Wolf. Zev possibly, Agency mayhaps, but not sure as I know they do more 9mm stuff.
 
Since all your pics are in the shop I'm assuming that this is happening when you hand cycle rounds through the gun, yes?
I can't see the important bit in your pics. Where is the rim of the case in relation to the breech face?

Take another picture of your malfunction but looking down into the ejection port and toward the rear.

And are you walking the slide down or letting it go free from all-the-way back?
 
Catfish said:
Since all your pics are in the shop I'm assuming that this is happening when you hand cycle rounds through the gun, yes?
I can't see the important bit in your pics. Where is the rim of the case in relation to the breech face?

Take another picture of your malfunction but looking down into the ejection port and toward the rear.

And are you walking the slide down or letting it go free from all-the-way back?
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I am not hand cycling. The two pictures of the jammed rounds were taken while sitting on my tractor after firing the gun. The others were taken in the house of just the components themselves. I will have to go back out later and get a picture of what you are asking for...
 
Well then... does it hand cycle rounds properly?
 
Catfish said:
Take another picture of your malfunction but looking down into the ejection port and toward the rear.
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I think I see where you're going with this. The round doesn't look centered, it's like it's shoved all the way to the left and catching on the edge of the barrel hood:

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and then if the... uh... bullet pushing dingus isn't square could it be shoving the round off to the side instead of straight?

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My rock slide is the same part (running 357sig but it's the same slide) and looks like this:

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and that same area on an actual glock slide that has just over 32k rounds of steel case ammo run through it. Still looks better than the rock above with a whopping 96 rounds through it (all brass).

1615502200172.png
 
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Jayne said:
then if the... uh... bullet pushing dingus isn't square could it be shoving the round off to the side instead of straight?
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Again, hard to diagnose without observing it in person, but I’m thinking it’s pushing the ass end of the cartridge down while it pushes it forward. Instead of feeding into the chamber, the nose of the bullet is jamming into the top of the chamber.
 
Update: Met a fellow member today, "get off my lawn" Andy. He owns a G23 and was kind enough to come to my house and help me figure this thing out. We swapped out various parts between my gun and his and came to the conclusion that, as someone here so eloquently labeled it, the "dingus" appears to be the culprit. When comparing the two slides side by side it is obvious that the angle on mine starts sooner leaving a shorter 'straight' or perpendicular surface to make contact with the casing. It may be hard to see in the pictures, but when it jams, the 'dingus' slides over the case instead of 'pushing' it into the chamber.

Thanks to all who helped me figure this out - especially Andy who took time from his Saturday to help.

Now I get to go argue with our friends at Rock Slide...
 

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Late getting back to this... It was hard to be sure in the picture, but that was my guess as well. I find Rock Slide stuff to be a little crude and unfinished. I have a barrel and basically had to polish out burrs and edges. I'm all for supporting local, but...

If you get a refund and are looking at non-premium options, the Brownell's slides are pretty good. Rockey Brass has some interesting options as well.
 
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