Split Barrel on my G20

[Trailbate]

So the wife and I just got back from Tennessee visiting family and while we were there my G20 saw about 4-500 rounds. I sit down at the table last night to clean it and notice something in my barrel, I cleaned the crap outta it and looked again and sure enough it looked like it was starting to split just past the chanber from 12 O'clock to 4 O'clock, i went down to my gunsmith and he had never seen anything like it. Now I have to call glock and try to get a new barrel... I dont have a clue how I could have split the barrel but I did. good thing I found it when I did or i could be typing with 2 fingers or missing a hand

[MONTEGOD7SS]

"Of course it's only had factory ammo in it, reloads are dangerous." Or something along those lines.

[Trailbate]

"nothing but factory ammo I dont trust reloads"... you thing glock will believe me, ive been practicing what im gonna say when they ask

[Trailbate]

now im stuck, free barrel from glock or a lone wolf ported... any suggestions?

[MONTEGOD7SS]

If you are wanting a Lone Wolf you might as well get a stock replacement to use as backup in case the LW needs to go back and get opened up a bit. I would tell GLOCK anything I needed to to get a replacement barrel, as long as I knew that I didn't do anything to cause the damage myself.

[MullahElRon]

Out of curiosity, what was the approximate round count and type of ammunition?

[lcarreau]

If this was due to hot ammo, I would have figured you would have seen other bad things before the barrel split. that is odd.

-Lonnie

[Bush Pilot]

Tell them you shoot hot reloads with lead bullets and wait for their reaction.

[Steve Koski]

...with the bullets loaded backwards to be extra deadly.

[Fatdaddy]

now im stuck, free barrel from glock or a lone wolf ported... any suggestions?

Both, most definitely. - the porting.

Somebody was looking after you, by the way.

[Brass Nazi]

...with the bullets loaded backwards to be extra deadly.

and loaded with WTF powder.

[Steve Koski]

And some lengths of Lee safety toilet chain for added deadliness.

[Brass Nazi]

To the OP: Now you can get a 40S&W barrel for it.


Well..........Then you may have to worry about the gun blowing up on you. Nevermind.

[Brass Nazi]

And some lengths of Lee safety toilet chain for added deadliness.

I bet the toilet change would make a good lanyard. It would have the added bonus of if you get stuck on a non flushing commode you may be able to get it up and running again.

[JLarsson]

I bet the toilet change would make a good lanyard. It would have the added bonus of if you get stuck on a non flushing commode you may be able to get it up and running again.

I'm pretty sure this is what we've been getting since January. :yesnod:

[Boge]

Tell them you shoot only "Extreme Shock" factory ammo. :biggrinjester:

[MakeMineaP99]

Fatigue is any interesting animal. Fatigue can occur for a variety of reasons, hot ammo may be a factor, but it isn't always the root cause.

[Steve Koski]

Gotta be a defective barrel. Material, heat treat, something went wrong.

[MakeMineaP99]

Could be something as simple as surface finish, chatter marks, residual stress from hammer forging, lots of factor. Fatigue is a huge umbrella.

[The10mmKid]

Where's the pics 'bate?

I gotta see this!

:ttiwwop:

The concerned G20 Kid

[Trailbate]

I dont think it was because hot reloads, and I watch my barrel real close when shooting lead, I honestly dont have a clue how it happened. pics to come when I get off work

[creophus]

I'd like to see pics also. Could this just be a deep scratch for cleaning or something in the bore?

Glock shouldn't hassle you about the barrel. I'd get that rather than a Lone Wolf.

[The10mmKid]

As a manufacturer, I'd want to know of ALL my defects . . . . helps me improve my product. If this is indeed a flaw, they need to investigate all production during that run.

They should give you a free replacement barrel just for your input on the investigation.

Now those barrels that are split like confetti from double charges, leaded barrel, etc. . . . [GLOCK spokesperson] "dummy, you're lucky you didn't loose a hand . . . . . NO BARREL FOR YOU" (barrel nazi):yikes:

My concern is I have a Gen2 G20 with easily 10K through it. I keep the loads on the mild side for practice. For carry, it's got hot ones. I almost always run the hot loads in the LW barrel. I don't trust the LW for consistent feeding yet, but I'm working on it.

'da Kid

[Washington,D.C.]

I had a Jarvis barrel crack right in the center of the feed ramp. The barrel looked pretty thin there. I have heard of factory Glock barrels with defective bores.

[Trailbate]

trying to get a good pic inside the barrel and cant quite get one, any ideas?

[Crazy4nitro]

Look to see if your Camera has a Macro Mode. The selection or Button might have a Flower shape to the Image next to it.
It will Focus up close like this Pic. (Showing the re-cut Leade so Lead Bullets chamber more easily)
http://www.glockpost.com/forums/picture.php?albumid=36&pictureid=706

'Nitro

[Crazy4nitro]

Here,it should look like this.
http://www.cnet.com.au/story_media/339285843/11-macro.jpg

'Nitro

[Brass Nazi]

http://lmgtfy.com/?q=how+to+take+close+up+pictures

[JLarsson]

Use a light source at the other end of the barrel. Adjust the position of the barrel relative to the light source until you get the illumination, relief, and detail that you want.

[JLarsson]

I gotta' remember to see if there's another page before I post. Crazy and BN have you covered.

[Trailbate]

Workin on the picture, me and the camera arent getting along real well right now... The wife is gonna take a good one and it will be up tomorrow.

[Trailbate]

http://www.glockpost.com/forums/picture.php?albumid=121&pictureid=752

[Trailbate]

http://www.glockpost.com/forums/picture.php?albumid=121&pictureid=753

[Trailbate]

no bulging on the outside, seems strange but its 1/10th deep and about 50-60 degrees around

[Crazy4nitro]

Wow....Something we all can look for in out Stock Barrels.

Nice Pic.

'Nitro

[MakeMineaP99]

Looks like a classic fatigue crack.

[Brass Nazi]

P99, Do you think that the barrel is flawed?

[MakeMineaP99]

Possible. All parts contain defects by design, known as notches. Notches can be from machining (every time a tool touches the part, you have a notch), by design (sharp edges and square corners), surface finish (rough vs. smooth) and that's not speaking to underlying material concerns.

Hammer forging is a great process from a production standpoint. Faster and less costly than broaching or point cutting, however, hammer forging does leave residual stresses barring a post process anneal and heat treat to remove.

Without taking the failure apart and doing failure analysis, it would be impossible to say what caused the failure. We know that parts are designed for a certain amount of cycles before failure. Anytime you put a load on a part, the part is wearing and you are doing irreversable damage. The part has a set number of cycles before failure, which can be predicted using the endurance limit of the material and other fatigue criteria. If the part is predicted to fail before the endurance limit, it is said to be designed for finite life. If the part is predicted to fail AFTER the endurance limit, it is said to be designed for infinite life. There's a curve referred to as the modified Goodman line that cames into play here (and yes I'm aware of the parabola, however, the Goodman line is sufficient for approximation purposes).

We know from the linear portion of the stress strain curve that steel behaves elastically and obeys Hooke's law (stress is proportional to strain) until the yield point. Each ramp up and down in the linear region is a cycle. So we run our calculation and say this thing is going to fail due to fatigue at 50 Bil cycles. OK, that analysis was for a highly polished part, in climate control. What happens when I go to an as forged or as cast part in a martime environment? That analysis is no longer valid.

The thing you have to remember is we have thermo stresses that come into play, we have surface conditions (polished, as forged, etc.), environment, corrosion, heat transfer, tool chatter, shipping and handling defects, and stress concentrators that all come into play which affect part life and ultimately failure, even if the part never yields. Amazing, isn't it?

Once a part has failed, we can predict, using a few methods, the most common and straight forward being linear elastic fracture mechanics (LEFM), how much longer we can keep the part in service.

Fatigue is a science in and of itself. If you started studing fatigue today and did so under you retired, you would just start to have an appreciation for how complex of a topic it is. There's that much out there.

[Trailbate]

thanks nitro... p99 thats what my gunsmith said but in words i could understand, gotta remember im just a hick from the hills of Tennessee, Thank yall for the input and keep an eye on your barrels.

[Trailbate]

Almost forgot, called up glock customer service and as as soon as they recieve my barrel they will inspect it and another one will be in the mail free of charge... my ported one from LWD should be here before then though

[Steve Koski]

That barrel is scrap metal!

[Bush Pilot]

Tell them some guy named Clark is teaching you to reload.

[Steve Koski]

And it was only 24 grains of tripple compressed Longshot. No biggie.