Is this worthy of sending back to Glock?

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J

Jeepers

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Aug 22, 2009
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Location
Jacksonville, NC
Hey guys
Ok so heres the thing, I just re-cleaned my new G22 after its first trip to the range and (I have no idea how I missed this in the shop when i bought it :confused:) I noticed the strange machining on the muzzle. Its like they were putting the crown on the muzzle and the barrel was not aligned properly with the tool.

here are some pics with the camera angled to the muzzle at 12,3,6,and 9 o'clock,
IMG_20110119_213856.jpg
http://i1215.photobucket.com/albums/cc517/skylined12/IMG_20110119_213334.jpg?t=1295495397
http://i1215.photobucket.com/albums/cc517/skylined12/IMG_20110119_204733.jpg?t=1295495450
http://i1215.photobucket.com/albums/cc517/skylined12/IMG_20110119_204748.jpg?t=1295495480

hope this works first time posting pics

I cant really speak on the accuracy of the pistol because I was shooting more to test proper function on a shot up target. Just hoping to get some advice, would you leave it be, talk to the retailer (bought it at cabelas) or talk to glock?

Thanks guys
 
I see 2 problems.
1) it's a Glock :neener:
2) I do see where they cut the crown incorrectly. I would send these pictures to Glock customer service. I suspect they will have good customer service and fix it.
 
They advertise perfection.... that is imperfect machine work. I would email them the pics and a link to this thread. If it isn't right, they should be happy to replace the barrel.
 
sorry crappy camera, the problem is the crown is cut at a pretty bad angle and it looks kinda rough... does that help describe it any better?
Hope I'm not over reacting but with a rough measurement with my calipers shows 0.079 of crown at 9 o'clock on the barrel and dang near zero 3 o'clock (with 12 o'clock being the top of the slide)
thanks
 
yeah Greg and Frozen your probably right I'll just get in contact with Glocks customer service and see what they have to say. Just didn't want to wast their time and my time with out a little advice haha
 
Yikes! Heck yeah, I'd call Glock. That's not a small problem, at all. That's a major flaw that will be detrimental to repeatable accuracy across different loads.
 
GLOOB said:
Yikes! Heck yeah, I'd call Glock. That's not a small problem, at all. That's a major flaw that will be detrimental to repeatable accuracy across different loads.
Click to expand...
By the time the bullet passes over that spot it is going over 1,000 feet a second already. I don't really see what, if any, negative impact it could have!
 
Glock will send parts to end users that can be removed by field stripping, so they should be willing to send you another. Ask for Anthony in customer service.
 
Haha thanks GLOOB I'm just embarrassed that I completely over looked it in the shop... just going to blame that screw up on the lighting in there ;-) In my defense I did grab one with a pretty tight and very decent breaking trigger well for a glock. haha So hopefully Glock can remedy this without too much hassle
 
That is an improperly cut crown, and it will negatively affect accuracy.

The rest of the barrel could be garbage and if it had a nice crown it would probably still shoot OK, on the flip side you could have the nicest match barrel with a bad crown and it will shoot poorly.
 
Ragtop5969,

The crown of the barrel is the last point of contact between the bullet and barrel. If it is off center, dinged up, or otherwise sloppy the barrel will not shoot to full potential.
 
Regular Joe pays around $500 for something that costs <$100 to make. I would think they could ship new barrel for your gun at no cost to you.
 
Yep, Ragtop. CoalDragger said it.

The crown and the chamber are the 2 most important parts of the barrel. As the bullet exits a good crown, the entire circumference of the base of the bullet should leave at the same time!

If the barrel is longer on one point, that will be the last point the bullet touches, sending it off axis. Then there's the muzzle blast. You know how a 10 mph wind affects a bullet's flight path? Well the muzzle blast is going thousands(??) of miles an hour, right at the crown. The escaping gas temporarily outraces the bullet. Gases will exit on the short side, first, which will also alter the bullet's path and may even partially destabilize the bullet.

Even small scratches and dings on the crown can affect POI and group size. This is why people have barrels recrowned.

To highlight the significance of the crown, even the diameter is a factor in accuracy. If the bore diameter of the crown isn't smaller or equal in diameter compared to any other point in the barrel, accuracy suffers. This is one reason people will cut down and recrown an innaccurate barrel if it is slugged and proves to be loose in the muzzle.
 
Last edited:
Muzzle crown photo

Having crowned about 150 muzzles in the past 30 years, i can say without any reservation, that muzzle crown is a mess !!! The crown must be re-cut, lapped, & polished. Actually the problem is an easy fix:

1. Notify glock of the problem. Send glock these photos.
2. Ship barrel to glock for inspection of your complaint.
3. Glock will either recut the barrel crown or send you a new barrel.

Give glock an opportunity to correct this obvious quality control issue & report back to the readers of this forum what the outcome was.
 
GLOOB said:
Yep, Ragtop. CoalDragger said it.

The crown and the chamber are the 2 most important parts of the barrel. As the bullet exits a good crown, the entire circumference of the base of the bullet should leave at the same time!

If the barrel is longer on one point, that will be the last point the bullet touches, sending it off axis. Then there's the muzzle blast. You know how a 10 mph wind affects a bullet's flight path? Well the muzzle blast is going thousands(??) of miles an hour, right at the crown. The escaping gas temporarily outraces the bullet. Gases will exit on the short side, first, which will also alter the bullet's path and may even partially destabilize the bullet.

Even small scratches and dings on the crown can affect POI and group size. This is why people have barrels recrowned.

To highlight the significance of the crown, even the diameter is a factor in accuracy. If the bore diameter of the crown isn't smaller or equal in diameter compared to any other point in the barrel, accuracy suffers. This is one reason people will cut down and recrown an innaccurate barrel if it is slugged and proves to be loose in the muzzle.
Click to expand...
You would have to prove that to me before I would believe it.
 
Would it be possible to have a trusted local gunsmith recrown this barrel? At least you would get your gun back fairly quickly.
 
You would have to prove that to me before I would believe it.
Click to expand...
Instead of doing nothing more constructive than casting aspersions at folk (not a very THR behavior, by the way), why not use the Internet to dig into the 100+ years of research on the topic and educate yourself?

GLOOB is correct in his statements. You can doubt them if you wish, but to do so is akin to doubting that heavier-than-air craft can ever fly.
 
rbernie said:
Instead of doing nothing more constructive than casting aspersions at folk (not a very THR behavior, by the way), why not use the Internet to dig into the 100+ years of research on the topic and educate yourself?

GLOOB is correct in his statements. You can doubt them if you wish, but to do so is akin to doubting that heavier-than-air craft can ever fly.
Click to expand...
You just did to me what you chided me for. Very Omniscient indeed. Not very THR behavior on your part either. I still don't believe either of you. Being as Missouri boy, you are going to have to show me. Isn't this country great that we all don't have to think and believe in lock step agreement. God Bless America!


A conclusion is not a destination, it's simply a convenient place to stop thinking.

Reading a thing doesn't automatically make it so; repeating it doesn't necessarily make it any truer.

Your quotes not mine!
 
Ragtop, your questioning of the effect of a crown on the performance of firearm proves your young age or inexperience or both.

Do yourself and others a favor by a least doing a little bit of reading before posting that someone needs to prove to you the effect of a crown on a firearm. Doubting it blindly is simply mis-information.

OP -send it back or ask for a replacement.
 
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