Posted: 12/7/2015 11:04:56 AM EDT
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This is my third G19 to do this. All factory threaded barreled Glocks. All had around 1000 rounds through them when barrel started to 'chip/pit' All near the chamber end, less than an inch in.
Frist one was January 2015 (XXC7##). I bought this one from the LGS the in Fall of 2014. I had the LGS send it back to Glock. 
Glock sent back a new G19 (XTY4##). I asked what caused the issue and they said 'not sure'. Three months (April 2015) and approximately 1000 rounds later same issue. Called Glock and explained the issue and mention this is the second one to do this. Glock says they are not familiar with this issue. I told them that you can find a few instances of this happening on the internet if you Google 'Glock barrel pitting'. 
Glock sent me a pre paid label and I sent in XTY4##. Glock sent back another new G19 (XXF3##). This one I counted every round and checked the barrel often. At the 400 round mark the barrel started to show light pitting, very shallow. Nothing changed till right around 900 rounds. That is when the deeper pit occurred. 
Ammo used was my reloads of 124gr Precision Delta HP, 3.7gr Tite Group and CCI primer. This is a subsonic load at around 1050fps. It is not anywhere near max pressure, it is a very lite load with the cases ejecting only a couple feet. The gun was shot 100% of the time with an Octane 45 suppressor. It is not the bullets doing this as I use them in my other G19 and Hi-Powers, but use Power Pistol for the powder. Is it Tite Group causing this? It is known to be a hotter burning powder. But I have not found any reported issues with TG causing this. To me it seems as the barrels are too hard or got a bad surface hardening treatment. I told Glock that subsonic ammo was used, but did not mention that I used reloads, they did not ask either. Accuracy does not seemed affected at this point. Should I send this one back? My guess the same thing will happen. Shoot it till it gets really bad? Or say screw it and buy a SiCo threaded barrel with metric threads? $200 
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hmmm....I'm interested in this, as my edc right now is the same gun- factory threaded barrel gen 3 g19. I've only put about 100 rounds through it yet, though.
Pure speculation on my part, but could it possibly be due to the backpressure with the can, its throwing crap back into the barrel? |
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I wish I had more insight, what I can tell you is I have two Glocks that have been shot extensively in the last few years, both seeing 40K+ of rounds down the pipe (or 20K+ a year for each G17/34 gen4's).
Both have shot a ton of titegroup also, maybe more than half of the total round count, often 300+ rounds per session (yes the barrels get hot, even super hot). Neither have been fired with s suppressor however. Something isn't adding up, and like someone has already mentioned, I think it has something to do with your loads and or the suppressor, and possibly the combination. ~g |
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I have heard of 'gas cutting' in barrels but have never seen pictures of what it looks like. I know you used the same bullets in different guns without issue and have ruled them out. I think an important data point is measure the bore of the barrel and the bullet just to make sure. Replacement barrels, same setup and components same barrel issue. Just does not seem likely that the replacement barrels all have the same problem.
Not a gunsmith or gun expert. Just a gun user. I have done extensive repair and troubleshooting on complex electronics systems. Anytime I rule out a possibility without good data I end up coming back to that point in time (days later!) with what was I thinking and fixing the problem. Mike |
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Well at this point any new 'tests' would involve another barrel or two. One to try a different bullet brand and another to try different powder. My guess is maybe the powder/suppressor combo???
As far a cleaning, just a bore snake every hundred rounds. CPL at around 400 with a patch. The main reason I posted was to see if there was anyone that 'heard' of something like this, and compare similarities. I am going to keep using the barrel to see if it get worse...I think it will. When I do contact Glock, I will mention the load I was using. If they tell me to FOAD on the warranty replacement I'll just get a SiCo barrel. Can cleaning is just with a tumbler, stainless pins, Dawn, and water. About once every new Glock 
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| I can't imagine what could possibly doing this... The glock barrels are nitrided, making the surface harder than a knife, and corrosion proof. It looks like either gouging, or bad corrosion, but neither should be possible. I can only agree that it seems a faulty treatment, but to get 3 in a row sounds less likely than winning the lottery. |
| I'll go with the suppressor causing it. That flaking is probably from vibrations/flexing of the barrel with the added weight of the can on it. If you get another barrel, run 1k rounds through it without the can and see if there is any signs of flaking. Do you have any way of taking high speed video of shooting it? If so, do that and then play it in slow motion and see how much that can whips around. |