9mm ejection question

[John from MD]

I put this in this forum for lack of a better place.

At the range I manage at my club, periodically I find a pile of 9mm brass about 3 feet in front of the firing line. I am hard pressed to figure out what kind of pistol/carbine ejects in such a manner. Does anyone have any idea what kind of gun ejects forward like this?

 

[Harrys]

One of the KEL-TEC bull pumps ejects the shells down and forward can't remember the model.

 

[outrider58]

Depending on the load(reloads), my Glocks will sometimes toss brass out to 2 o'clock. Most times, they go to 3-4 o'clock though.

 

[Worsley]

Depending on the load(reloads), my Glocks will sometimes toss brass out to 2 o'clock. Most times, they go to 3-4 o'clock though.

Same with my Glocks, the 19X seems to have the most consistent ejection pattern of the bunch.

 

[ironpony]

Yup, I find I can reload 9mm to eject to various "clocks" and I believe there is a chart showing what is going on with each directional ejection. I Could Be Wrong.

 

[John from MD]

Yup, I find I can reload 9mm to eject to various "clocks" and I believe there is a chart showing what is going on with each directional ejection. I Could Be Wrong.

There is but it was really made for gas operated rifles.

 

[John from MD]

Depending on the load(reloads), my Glocks will sometimes toss brass out to 2 o'clock. Most times, they go to 3-4 o'clock though.

Changed your recoil spring lately?

 

[Archeryrob]

In a range with sidewall, I think the rotation of the casing and angle it hits the wall could affect weather it bounces forward or backwards as to how it hits the wall.

 

[outrider58]

Changed your recoil spring lately?

How often should I? I've got about 1500 on my current range gun spring. It is the heaviest spring (14#?) I could find that would still cycle my G19 with a brake.

 

[John from MD]

How often should I? I've got about 1500 on my current range gun spring. It is the heaviest spring (14#?) I could find that would still cycle my G19 with a brake.

Glock used to recommend 5000 round changes but I haven't shot one in 20 years so I don't know what they recommend now. When using reloads, ejection from a recoil operated gun is affected by variance in powder charge, neck tension and bullet seating depth.

Variation in charge weight obviously changes the gas pressure but so does variance in neck tension and bullet seating depth. The more times you load brass, the harder the mouth becomes and so you don't get the same neck tension.

Gunsmiths who specialize in 1911 Bullseye pistols know how to adjust the ejector to have your cases drop at your feet while still having reliable operation. This was important before the days of brass catchers as we all wanted to retain our own brass.

 

[4g64loser]

I put this in this forum for lack of a better place.

At the range I manage at my club, periodically I find a pile of 9mm brass about 3 feet in front of the firing line. I am hard pressed to figure out what kind of pistol/carbine ejects in such a manner. Does anyone have any idea what kind of gun ejects forward like this?

One of my ar pattern 9s has been tuned for a slightly forward ejection so that I don't sting the guy next to me. If the cases look "normal" I'd bet on this.

If the cases are straked, they came from an mp5. Mine sends them a lot further than three feet forward, however. If the mp5 needs repairs, the cases might end up closer.

 

[John from MD]

One of my ar pattern 9s has been tuned for a slightly forward ejection so that I don't sting the guy next to me. If the cases look "normal" I'd bet on this.

If the cases are straked, they came from an mp5. Mine sends them a lot further than three feet forward, however. If the mp5 needs repairs, the cases might end up closer.

I thought about an AR pistol, it may well be. The cases are not from a MP5 and the gun is not suppressed either. Next time I find them, I'll look at the primers and see if I can tell if it was a standard pistol or AR type.

 

[outrider58]

One of my ar pattern 9s has been tuned for a slightly forward ejection so that I don't sting the guy next to me. If the cases look "normal" I'd bet on this.

If the cases are straked, they came from an mp5. Mine sends them a lot further than three feet forward, however. If the mp5 needs repairs, the cases might end up closer.

Speaking of which, my 300Blk SBR will just about drop all my brass into a Solo cup 4 feet away @ 4 o'clock. That makes it nice when I police my brass after a range session.

 

[John from MD]

Speaking of which, my 300Blk SBR will just about drop all my brass into a Solo cup 4 feet away @ 4 o'clock. That makes it nice when I police my brass after a range session.

Plus it doesn't bang up the case mouths.

 

[John from MD]

In a range with sidewall, I think the rotation of the casing and angle it hits the wall could affect weather it bounces forward or backwards as to how it hits the wall.

No sidewall. Most folks stand at the line table with their arms extended so that the brass will usually be ejected onto the concrete pad or, if it hits a roof support, the odd round will be somewhere in front. The odd thing about those that I find is that they are 3 to 4 feet in front of the line and in a pile of about a 1 foot diameter.

 

[4g64loser]

I thought about an AR pistol, it may well be. The cases are not from a MP5 and the gun is not suppressed either. Next time I find them, I'll look at the primers and see if I can tell if it was a standard pistol or AR type.

My inner gun tuning geek is curious now. Haha.

My Colt 9 (bone stock as issued to a PD during clinton years) is a bit more erratic than my other 9 ar. The other one sends them all forward.

 

[John from MD]

My inner gun tuning geek is curious now. Haha.

My Colt 9 (bone stock as issued to a PD during clinton years) is a bit more erratic than my other 9 ar. The other one sends them all forward.

Do your AR pistol caliber receivers have brass deflectors?

 

[4g64loser]

Do your AR pistol caliber receivers have brass deflectors?

Yes. The Colt is as issued. Phenolic deflector obscuring part of the ejection port. The other one has a newer, slightly lower durometer, deflector of roughly the same dimensions.

 

[John from MD]

Yes. The Colt is as issued. Phenolic deflector obscuring part of the ejection port. The other one has a newer, slightly lower durometer, deflector of roughly the same dimensions.

The difference in materials may be why you have different ejection patterns.

 

[ironpony]

Looking forward to the answer to your question.