[kglack43]

I've noticed a consistent small horizontal dance on my spent casings from my Glock 20. Anybody out there have an idea as to what this might be?

 

[10mil]

Dance? & I've seen straight lines but always assumed it was from my mag.what brand are they have to tried others

 

[kglack43]

Sorry, I said line but the dang phone typed dance and I didn't check it before I hit send

 

[kglack43]

And this is only from spent shells once they've been fired and ejected. Not from cartridges that I manually eject by pulling back on the slide

 

[buzznrose]

And this is only from spent shells once they've been fired and ejected. Not from cartridges that I manually eject by pulling back on the slide

Can you send some pictures?

 

[kglack43]

Here's a few lined up...

 

[kglack43]

This shows that the dent doesn't line up with any part of the magazine ... I only use Glock mags.

 

[buzznrose]

Sorry,, I have no idea the cause..never saw that before.

 

[Kmurray96]

Take the slide off and put an empty case in the mag and insert it. Hold the slide upside down next to the frame and see if the crease lines up with the extractor. The 9MM has a different extractor from the other calibers and there's always a chance, albeit slim, that it might be a factory mistake.

Do your casings strike anything as they're ejected? Might be something they're hitting against at the range, although I doubt they're ejecting with that much force.

 

[kglack43]

Outdoor range and the casings are hitting many different places although in the same general area. I'll try the advise you offered.

 

[G-23]

Dirty chamber?

 

[10mil]

Yea I've never seen what before and i agree there no way the mag could cause that. I just get black lines on mine.

 

[kglack43]

Dirty chamber?

Just cleaned prior to shooting...

 

[kglack43]

Like this?

 

[pkaltx]

Looks like as the slide is coming back the bottom of the barrel it is making contact with the shell in the magazine. This is probably causing your dent. As to why, I have no idea. I would suggest you take it to a gun smith.

 

[kglack43]

so this is not a common thing... Will do ASAP

 

[G-23]

Looks like as the slide is coming back the bottom of the barrel it is making contact with the shell in the magazine. This is probably causing your dent. As to why, I have no idea. I would suggest you take it to a gun smith.

I was going to say, "It is not possible for the barrel to come back and contact the cartridge there." But it might under a couple circumstances while retraction of the spent case I suppose under some unforseen reasons the upper edge of the chamber could, so look for:

A possibly broken locking block or locking block pin,

maybe the slide lock is installed backwards.

But I would try this first before looking at that. Shoot a round from a fully loaded magazine, yes just one round.

Clear the gun and locate the spent cartridge for the dent. Now, inspect the next (top) live cartridge in the magazine.

Which casing had the dent? The fired one or the next found to be feed?

 

[kglack43]

Good call on checking the nets round... Will do next time I get where I can pull off anther round...

 

[G-23]

Good call on checking the nets round... Will do next time I get where I can pull off anther round...

Any change in the casings?

 

[zipper046]

Have seen this before caused by the case contacting the extractor.