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Discussion Starter · #1 ·
Hi, noob question here but it concerns me and didn't come up with any hits on a search. I bought a new G27 Gen4 and fired my first hundred rounds with it last night. One box was Federal and the other Max something (sorry I didn't remember more). Both types swelled in the bottom third of the case. I'd wondered if the casing is too small, the breech too large, or the slide starts moving back while under enough pressure to swell the case?

Is this normal or is there something to be concerned with? By the looks of it I'd never fire reloads. I'll try to take a photo and upload it after I get out my calipers to measure the swell. They might help illustrate the bulge.

Thanks in advance...
 

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Hi, noob question here but it concerns me and didn't come up with any hits on a search. I bought a new G27 Gen4 and fired my first hundred rounds with it last night. One box was Federal and the other Max something (sorry I didn't remember more). Both types swelled in the bottom third of the case. I'd wondered if the casing is too small, the breech too large, or the slide starts moving back while under enough pressure to swell the case?

Is this normal or is there something to be concerned with? By the looks of it I'd never fire reloads. I'll try to take a photo and upload it after I get out my calipers to measure the swell. They might help illustrate the bulge.

Thanks in advance...
This is normal, especially in a Glock .40. Glock is not the only manufacturer that uses a barrel design that has an unsupported chamber. This means that the last few mm of the casing is not completely supported. It caused the casing to bulge a little. This is nothing to be concerned about. It is perfectly normal. If you were to reuse this brass for reloading then you would need to resize the brass using a one of a couple different methods. If you don't reload you have nothing to worry about.
 

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tact is right on it, youll also see deformation in 9mm casings aswell the open end front of brass, will look like it was slightly pinched, this too is normal. as to the cause of this, i really havent come to any findings, somewhere while being extracted from the breech it strikes some part of the slide. anyone have anything on this?
 

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Discussion Starter · #4 ·
Thanks for the reassurances. I feel better now.

I guessed it may allow for better loading and be part of why Glocks perform so well. Sort of a bigger hole for the bullet to be thrown into before firing. My Charter Arms AR7 can't seem to load anything reliably, I like how the Glock's barrel tilts to facilitate receiving the round. Sorry, I'm new to this style of gun and have about everything to learn. I sure like it though, can't wait to get to the range again.

Just a thought, do the LoneWolf 9mm barrels do the same thing as you described? I'll find out when I get one I guess. They're part of the reason I got the .40, it can be a 9 as well.
 

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Just a thought, do the LoneWolf 9mm barrels do the same thing as you described? I'll find out when I get one I guess. They're part of the reason I got the .40, it can be a 9 as well.
I have a LWD barrel and it is machined the to the same spec. Its really not and issue. Don't sweat it. Shoot like there is no tomorrow and have fun along the way.
 

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Shoot like there is no tomorrow and have fun along the way.
I second that motion !

 
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