User Panel
User Panel
User Panel
|
Posted: 4/25/2020 5:00:34 PM EDT
[#1]
What kind of brand new 9mm?
Those cases look like they were producing very high pressures in an unlocked action. Most, but not all 9mm pistols have a locked breech. There are a very few that are blowback, though. |
|
|
|
Posted: 4/25/2020 5:03:32 PM EDT
[#2]
Blowback - 9mm PCC
I'm trying to determine if it's the gun or the ammo. I'm not familiar with troubleshooting out of battery issues. |
|
|
|
Posted: 4/25/2020 5:11:55 PM EDT
[#3]
It could be an out of battery firing issue. I have had a couple of 9mm ARs, and have handloaded some 147 grain loads towards the max end of listed data.
None of the cases looked anything like those, however. |
|
|
|
Posted: 4/25/2020 5:19:18 PM EDT
[#4]
I'm hoping that someone seeing the image would chime in with "classic example of X".
It's a closed bolt with factory stock trigger. I was sighting in and setting up for the shot. Nothing quick. All rounds ejected, amazingly when you see the image, until the last catastrophic failure. |
|
|
|
Posted: 4/25/2020 5:20:09 PM EDT
[#5]
What is that streak in the brass on the fired cases? Looks like the cases were not supported. It starts out with slight brass deformation until you get to the point that the case head was unsupported and blew out at the head.
If the kaboom happened be fore the breech closed, how did the firing pin go forward when the breech was unlocked? Are the case lengths correct? Not allowing the breech to close. Then see above comment. Are cases sizes correctly so they don’t stop prematurely? Theres still the issue of unlocked breech. And did the firing pin get stuck in a protruding position and set the primer off prematurely |
|
|
|
Posted: 4/25/2020 5:28:50 PM EDT
[#6]
It's blowback, non-locking.
I think the streak is the chamber edge???? There appears to be a portion on the bolt/chamber interface that leaves a bit of the case unsupported. Not sure how much though. Can a 9mm round typically withstand not being fully supported if this were the case? |
|
|
|
Posted: 4/25/2020 5:32:05 PM EDT
[#7]
Getting called away - dammit. Gotta go.
|
|
|
|
Posted: 4/25/2020 5:34:10 PM EDT
[#8]
Can a 9mm round typically withstand not being fully supported if this were the case? Yes, it can. But there are limits of course. I think you have a gun firing out of battery, but I don't know why. Worth checking the firing pin. |
|
|
|
Posted: 4/25/2020 5:35:00 PM EDT
[#9]
I had a similar problem. I fixed it with a heaver buffer.
7.5 oz pistol buffer and a heavy hammer spring... and quit shooting remaufactured ammo |
|
|
|
Posted: 4/25/2020 6:35:36 PM EDT
[#10]
From my experience:
The risk of a Kaboom is more likely with re-manufactured ammo. Many Kabooms are in fact as a result of re-manufactured ammo, they are cheaper for a reason from the Kabooms I have seen... Then there is non locked breech chambers with high pressure ammo like the 9mm Luger cartridge (over 30K PSI)... Finally, there are unsupported chambers using high pressure ammo like the 9mm Luger. I personally don't trust the combination of the above... If one is shooting a straight blow pistol or carbine/rifle be sure the bolt/recoil spring are plenty strong/stiff... I certainly prefer a delayed blow-back or locked breech pistol/rifle whenever possible and certainly one with a supported chamber. Good luck. |
|
|
|
Posted: 4/26/2020 10:12:50 AM EDT
[#11]
I certainly prefer a delayed blow-back or locked breech pistol/rifle whenever possible and certainly one with a supported chamber. As do I. However my AR 9mm carbines have been plenty capable of handling +p type loads. Even some that bulged brass in my P226. Loads were worked up carefully, and the AR does better, the locked breech P226 exhibited case bulges way before the AR did. Out of a sense of prudence, I didn't even try the hottest loads in the P226. Not that either one is weak. Just that those particuliar handloads were too high in pressure for the SIG, but not the AR. |
|
|
|
Posted: 6/1/2020 6:07:38 PM EDT
[#12]
ZAMAK frame and a fixed steel barrel.
The slide was steel and VERY chunky and heavy for such a small pistol. The brass he showed me was NOT reloadable. Not as bad as the ones here but rather 'interesting' looking. Case mouths badly flared out. The only thing I thought of at the time was "That thing is opening under a lot of pressure." He did complain it seemed very loud to him, but I doubted he had a good 'calibration level' being an inexperienced shooter. His muffs are not anything I would have trusted my hearing to even then. Lightweight ear canal type muffs with a plastic frame supplying all the sealing pressure. I would be surprised if they made 25 dB, even back then. Around $15 or so at the time. |
|
|
|
Posted: 6/10/2020 4:03:10 PM EDT
[#13]
The #1 cause with reman ammo is reman ammo. Shitty quality control leads to out of spec ammo.
I think I would start "plunk" testing any rounds you have left. Make sure they all fit into the chamber fully. The thing with 9mm is it is a tapered case. You can't properly resize it by using a conventional resizing die. Unless the brass is processed with a roller type resizer you will leave a bulge at the bottom of the brass that can and will stick in a tight chamber. If you dropped the hammer on one of those rounds you would end up with an OOB discharge. The fact that you have many rounds that look like that before the actual case blowout would lead me in that direction. I can't really see any of the primers but the profile of the round in the center doesn't seem to show evidence of primer flow or cratering that is common with high pressure conditions. |
|
|
|
Posted: 6/10/2020 4:18:01 PM EDT
[#14]
I am going to chalk this one up to the Chinese Corona Virus. We are now well over 100k.
Press F for respect... |
|
|
|
Posted: 6/21/2020 9:02:50 PM EDT
[#15]
Looks like 9mm firing in a .380 chamber.
|
|
|
|
Posted: 7/13/2020 3:03:31 PM EDT
[#16]
I had a similar kaboom in a 9mm straight blowback AR-style PCC. It was happening because the case was deforming as it entered the chamber, due to there being no feed ramp before the barrel. The cases were being jammed into the barrel, sometimes deforming the bullets and sometime slightly deforming the brass. All it took was one that was deformed enough to not adequately enter the chamber fully. Thankfully, only the base plate on the magazine blew out with no damage to the gun (or to me!).
I fixed the issue by installing one of these: https://taccom3g.com/product/taccom-glock-lower-feedramp/ Manually cycle through a few rounds and inspect the cases/bullets for deformation to see if you're experiencing a similar issue. |
|
|
|
Posted: 7/15/2020 4:47:46 PM EDT
[#17]
Quoted: Firing a brand new 9mm this morning and I got a KaBoom. The image of the cases shows the apparent issue was happening before it all went to hell. I finally got to the round that wouldn't take the pressure. I didn't notice any thing wrong as I was shooting. Only after it went boom did I check out the brass. All the cases showed signs of bulging or a line (chamber edge I'm guessing). The KaBoom took out the extractor, blew the mag out of the well and took a chunk out of the lower. The ammo was re-manufactured 147gr. Comments appreciated as I get through this. https://i1116.photobucket.com/albums/k578/DoubleSun1/IMG_4834.jpg Almost looks to me like the chamber could be short or otherwise out of spec as to prevent the rounds from fully chambering. If there was something preventing the round from chambering, the build up would start pushing subsequent rounds further & further back. I’d start with checking headspace. |
|
|
|
Posted: 8/21/2020 3:45:42 PM EDT
[#18]
Quote HistoryQuoted: Almost looks to me like the chamber could be short or otherwise out of spec as to prevent the rounds from fully chambering. If there was something preventing the round from chambering, the build up would start pushing subsequent rounds further & further back. I’d start with checking headspace. Quote HistoryQuoted: Quoted: Firing a brand new 9mm this morning and I got a KaBoom. The image of the cases shows the apparent issue was happening before it all went to hell. I finally got to the round that wouldn't take the pressure. I didn't notice any thing wrong as I was shooting. Only after it went boom did I check out the brass. All the cases showed signs of bulging or a line (chamber edge I'm guessing). The KaBoom took out the extractor, blew the mag out of the well and took a chunk out of the lower. The ammo was re-manufactured 147gr. Comments appreciated as I get through this. https://i1116.photobucket.com/albums/k578/DoubleSun1/IMG_4834.jpg Almost looks to me like the chamber could be short or otherwise out of spec as to prevent the rounds from fully chambering. If there was something preventing the round from chambering, the build up would start pushing subsequent rounds further & further back. I’d start with checking headspace. Broken off piece of mouth of shell? |
|
|
|
Posted: 8/21/2020 3:59:34 PM EDT
[#19]
Are there projectiles stuck in the barrel?
@DoubleSun |
|
|
|
Posted: 8/21/2020 4:05:42 PM EDT
[#20]
Thats firing way out of battery......like you have a small ring from a split case left in your chamber.....
|
|
|
|
Posted: 10/4/2020 4:38:54 PM EDT
[#21]
What gun is it?
|
|
|
|
Posted: 10/24/2020 11:31:36 AM EDT
[#22]
Remanufactured ammo has never had a stellar reputation. I'm not saying it can't be fine, you are dealing with a company that processes millions of "used" brass cases without any knowledge of each case's history. If anything is stuck to the interior of the case (mud, spider nest, etc.) you can get over pressure. Oddball military headstamps need different powder charges or chucked. A double or triple charge will blow any gun up.
Virtually all manufacturer's warn against using reloaded ammo, so there's that. |
|
|
|
Posted: 10/24/2020 11:33:59 AM EDT
[#23]
I had a .45acp round get stuck in the barrel of a Sig P220 in the mid 80's shooting a local gun shop's reloads. No powder, just the primer drove it in. They lost a customer, not only for their product, but for any other remanufactured ammo vendor.
|
|
|
|
Posted: 11/18/2020 9:16:21 PM EDT
[#24]
I’m going to venture and say the handgun was based on a subgun with a telescoping bolt.
|
|
|
|
Posted: 2/25/2021 9:34:14 PM EDT
[#25]
Quote HistoryQuoted: Thats firing way out of battery......like you have a small ring from a split case left in your chamber..... THIS. |
|
|
|
Posted: 9/7/2021 10:34:30 PM EDT
[#26]
I'd go at it this way.
1. Plunk a few rounds from the same lot into the chamber and see if they stick. If so try the same with quality factory loads. You're not shooting anything so cost isn't a problem. If both stop short of fully entering the chamber then you likely have something in front of the step of the chamber holding the brass up. If only the reman sticks then you have bad reman ammo and its time to junk it. 2. Pull one of the reman rounds in a bullet puller and weigh the charge. If it's closer to 10grns of powder than 5 then it was double charged and that's your problem. 3. If everything else looks ok then try adding mass to the bolt. The lock time on a blowback action is completely set by the mass of the bolt and the strength of the recoil spring. Of those two the mass of the bolt is the dominant factor. If the ammo is good and there's nothing stuck in the chamber then it's time to increase mass of the bolt, but I am with the others, this sounds like a classic ammo failure. |
|
|
|
Posted: 12/12/2021 12:22:51 AM EDT
[#27]
@DoubleSun
Did you ever figure out the problem? I suspect your barrel is short throated, which resulted in the bullets sticking in the leade, preventing them from fully chambering, and the gun somehow was able to fire out of battery. It's a common problem with 9mm AR barrels. A lot of manufacturers are not using SAAMI spec reamers. Faxon even has a notice up on their site. I only trust Faxon and Macon Armory to make 9mm AR barrels with chambers/throats that are within SAAMI spec. |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
