I've been looking online, and I haven't been able to come up with am answer.  Here is the problem...

My brother took a brand new G34 to the range today.  As I was watching him shoot, I noticed his ejection pattern was all over the place.  Spent casing were landing at 12 o'clock five feet out, about a foot away to the 4 o'clock position, straight back, and one even landed right inside his inner elbow joint.  Not only was the ejection pattern all over the place, but the velocity of the spent cases varied as well, more often then not, it was weak.  We only ran armscore and my reloads through it.

The only info I can find online is about Glocks sending spent brass at the shooters face, and that problem was resolved several years ago.

My question is, could something be wrong with the gun, or is it the ammo?  I believe we put about 150 rounds through it.  So maybe is it a break in issue? 

I've been looking online, and I haven't been able to come up with am answer.  Here is the problem...

My brother took a brand new G34 to the range today.  As I was watching him shoot, I noticed his ejection pattern was all over the place.  Spent casing were landing at 12 o'clock five feet out, about a foot away to the 4 o'clock position, straight back, and one even landed right inside his inner elbow joint.  Not only was the ejection pattern all over the place, but the velocity of the spent cases varied as well, more often then not, it was weak.  We only ran armscore and my reloads through it.

The only info I can find online is about Glocks sending spent brass at the shooters face, and that problem was resolved several years ago.

My question is, could something be wrong with the gun, or is it the ammo?  I believe we put about 150 rounds through it.  So maybe is it a break in issue?

ammo + new springs
firm grip and shoot many rounds

We are going to try different ammo next time out.  I am reluctant to pin it only on the ammo because even though it's cheap, we haven't had any issues with it through a Gen 5 G19&17, or a cz75.

Your thinking about it too much.  If the gun shoots accurately and reliably, and cases aren't hitting you, then it's not a problem.

2k rounds through my glock 19 and i have no clue where the cases go. As long as they aint hitting me i pay no attention

The Gen4 9mm Glocks all had an issue with the ejector throwing cases straight back into the shooter's face.  I had that with a G26.  I upgraded the trigger which came with a replacement ejector.  That stopped the brass in the face issue.

Glock corrected it by using a new ejector, and if you sent the gun to them, they would replace it for you.  But, if you're just going to use an aftermarket drop-in trigger like me, it's not necessary.

As for erratic patterns, that seems to be the norm for Glock 9mm, at least the Gen4 versions.  Even after they fixed the brass in the face problem, the dispersal pattern was all over, just not in the face.

Your thinking about it too much.  If the gun shoots accurately and reliably, and cases aren't hitting you, then it's not a problem.

To be honest, I was thinking the same thing

2k rounds through my glock 19 and i have no clue where the cases go. As long as they aint hitting me i pay no attention

Good point.  I just happened to notice where his brass was going when I was watching him.  And on the other hand, I have no idea where my CZ throws it either

Thank you all for your response.  Happy Thanksgiving

I had the same issue with my M&P15. Brass was at the 5 oclock, then all of a sudden about 3k rounds later at the 2 oclock. Same ammo. It shot accurate, so i was over thinking it.

So no worries.

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Not to worry. Everybody will eventually get erection problems.

Not to worry. Everybody will eventually get erection problems.

Or election problems...

I also don't really notice the brass when I am shooting, but I do notice it when others are shooting.  I particularly notice when guns send the brass flying further than usual and usually find out the ammo was loaded hot. 

Not sure if mentioned, but was the ammo in question 115gr?  124 gr?  Just curious as I was told when I bought my first Gen 4 Glock to give it about 1000 of factory 115 gr ammo and see.  This was right after Glock started shipping with the revised springs (0-4-2) for the 17 and 34.  I haven't noticed the brass to the face issue, but I have seen a number of early Gen 4 17s and 19s that do. 

I also don't really notice the brass when I am shooting, but I do notice it when others are shooting.  I particularly notice when guns send the brass flying further than usual and usually find out the ammo was loaded hot. 

Not sure if mentioned, but was the ammo in question 115gr?  124 gr?  Just curious as I was told when I bought my first Gen 4 Glock to give it about 1000 of factory 115 gr ammo and see.  This was right after Glock started shipping with the revised springs (0-4-2) for the 17 and 34.  I haven't noticed the brass to the face issue, but I have seen a number of early Gen 4 17s and 19s that do.

When I contacted Glock to ask about the brass in the face problem. they said they recommend using only factory ammo, and 9mm should be 124 gr for best results.

They fixed the brass-face issue.  I happened to get a good deal on consignment for my G26, and it had the older ejector.  My G30 I bought at the same time, even though it's not 9mm, used the same newer ejector part number Glock started putting in the 9mm guns.

I also don't really notice the brass when I am shooting, but I do notice it when others are shooting.  I particularly notice when guns send the brass flying further than usual and usually find out the ammo was loaded hot. 

Not sure if mentioned, but was the ammo in question 115gr?  124 gr?  Just curious as I was told when I bought my first Gen 4 Glock to give it about 1000 of factory 115 gr ammo and see.  This was right after Glock started shipping with the revised springs (0-4-2) for the 17 and 34.  I haven't noticed the brass to the face issue, but I have seen a number of early Gen 4 17s and 19s that do.

He was shooting 115.  I didn't even think to check the spring numbers, figured that was all sorted out already.  I have 124, 135, and 147 I'm going to run through it next time we go.  I've always preferred 124 in Glocks, I seem to be more accurate with that weight.  In fact I'm beat with 124, then 147, and finally 115. 

He was shooting 115.  I didn't even think to check the spring numbers, figured that was all sorted out already.  I have 124, 135, and 147 I'm going to run through it next time we go.  I've always preferred 124 in Glocks, I seem to be more accurate with that weight.  In fact I'm beat with 124, then 147, and finally 115.

Cool.  Was just wondering.  Yeah, I thought the issue of current parts with the Gen 4s were history.  For probably 3-4 years now.  Mine all came with the 0-4-2 action spring, 30274 ejector and extractor.  My buddy's Gen 4 19 that he bought used had the 336 ejector.  Not sure about the action spring.

I mostly have 115 gr as that's what is usually on sale in bulk.  I would shoot 124 gr as well if it was on sale often too.  Not picky. 

One thing I did notice that sometimes affects ejection pattern is those who have an extremely high thumbs forward grip, where their thumbs are along the slide.  I assumed that they are putting some pressure on the slide and slowing it down here and there.  I know I suspected that was happening to me during one USPSA match with my 17.  I've also suspected it here and there with other shooters. 

Armscore

Armscore

yups

When the gun hasn't been fired in a while, I notice it will eject pretty forcefully

Armscore

Is that stuff that bad?  I was going to buy a bunch at the last gun show, but I went too late.  Maybe a good thing.

When the gun hasn't been fired in a while, I notice it will eject pretty forcefully

Really?  I guess I never really noticed.  What's "a while"?  I have a few guns that I haven't shot in at least a few months.  One maybe even a year.  Kind of makes me want to try and see.  haha