User Panel
User Panel
User Panel
|
Posted: 7/15/2020 9:59:39 AM EDT
[#1]
Probably a slam fire. Check the BCG and make sure the firing pin moves freely and smoothly. Keep that shit clean.
|
|
|
|
Posted: 7/15/2020 10:10:27 AM EDT
[#2]
Slow fire or rapid fire?
Slow fire: what the post above says. Rapid fire: could be the result of bolt bounce. Bolt bounces backwards off the bolt face, partially extracting the cartridge as hammer comes forward. A buffer (5.5 oz. minimum, 6.5 oz - 8.5 oz preferred) with sliding internal weights helps prevent bolt bounce. |
|
|
|
Posted: 7/15/2020 11:00:28 AM EDT
[#3]
Slow fire, I’ll clean everything and double check the bolt. I have been giving thought to the JP silent capture system. I shot one and really liked the recoil pulse. Don’t know if it would affect what happened
|
|
|
|
Posted: 7/15/2020 12:34:50 PM EDT
[#4]
Quote HistoryQuoted: Slow fire, I’ll clean everything and double check the bolt. I have been giving thought to the JP silent capture system. I shot one and really liked the recoil pulse. Don’t know if it would affect what happened Definitely check the firing pin and clean/flush/inspect the FP channel. Could be crud or a little piece of brass caught in there. Please report back on what you find. If it's a FP issue, the spring system should have no real effect on the kaboom, but may help moderate the recoil impulse. |
|
|
|
Posted: 7/15/2020 1:54:39 PM EDT
[#5]
Quoted: Colt upper, lower, Colt 9mm recoil buffer and spring, spinta bolt, faxon barrel. Was shooting suppressed , last round in 20 round mag went kaboom and not pew. Case was a mess, primer pushed out, and bullet stuck just in the bore. No damage to the gun, the gun was dirty. How can I prevent this from happening again? No, I didn’t take pictures of the case. Any idea? Use a locked breech or delayed blowback instead of simple blowback. |
|
|
|
Posted: 7/16/2020 3:41:46 AM EDT
[#6]
Factory ammo or reloads?
One of my concerns has always been the possibility of picking up someone's worn out 9mm Major brass without knowing it. |
|
|
|
Posted: 7/26/2020 2:40:21 PM EDT
[#7]
Sorry it took so long to update, life issues.
Have the gun a good cleaning and inspected everything. No damage to anything. It was pretty dirty with caked on carbon on the breach face that scrubbed off. The bolt was fine, extractor was good, fireing pin moved freely. Made sure f/o channel was clean. No issues. Now, after giving it some thought the issue may be the 20 round mags. I have had last round malfunction with the 20 round mags. The kaboom was the last round of the mag. Not sure how it could happen but I’ll look hard at the mags. Thought? |
|
|
|
Posted: 7/27/2020 9:28:08 PM EDT
[#8]
I have a Glock mag lower surrounded by a piece build upper and lower. I get a lot of bump fired doubles and triples. Every 400-500 I get an OOB discharge. Only 2 or 3 have ruptured. At least that I've noticed. But I've found at least a dozen heavily bulged cases obviously fired well out of battery. I've worked up to a 11 or 12oz buffer and rifle spring in a carbine RE. The problems were worse with carbine buffer and spring. But I'm not a lefty and 9mm doesn't normally result in anything catastrophic.
|
|
|
|
Posted: 7/28/2020 7:32:25 AM EDT
[#9]
Quote HistoryQuoted: I have a Glock mag lower surrounded by a piece build upper and lower. I get a lot of bump fired doubles and triples. Every 400-500 I get an OOB discharge. Only 2 or 3 have ruptured. At least that I've noticed. But I've found at least a dozen heavily bulged cases obviously fired well out of battery. I've worked up to a 11 or 12oz buffer and rifle spring in a carbine RE. The problems were worse with carbine buffer and spring. But I'm not a lefty and 9mm doesn't normally result in anything catastrophic. Out of curiosity, have you tried a buffer that has sliding weights inside to prevent the OOB discharge? Colt reportedly had the same problem with their SMG 9mm with the solid buffer, and switched to a sliding weight buffer to fix the problem. The deadblow effect helps prevent OOB discharges resulting from bolt bounce. |
|
|
|
Posted: 7/28/2020 11:30:32 AM EDT
[#10]
Quote HistoryQuoted: Out of curiosity, have you tried a buffer that has sliding weights inside to prevent the OOB discharge? Colt reportedly had the same problem with their SMG 9mm with the solid buffer, and switched to a sliding weight buffer to fix the problem. The deadblow effect helps prevent OOB discharges resulting from bolt bounce. No, I have not. |
|
|
|
Posted: 7/28/2020 2:41:33 PM EDT
[#11]
I’m considering the JP SCS system. I’ve shot a JP rifle wit was really smooth
|
|
|
|
Posted: 7/28/2020 7:49:32 PM EDT
[#12]
Quote HistoryQuoted: I’m considering the JP SCS system. I’ve shot a JP rifle wit was really smooth JP SCS lowers the mass of bolt buffer system , and compensates with springs.....not a good idea in my opinion. At the end of the day, no substitute for mass in a blowback gun. Since I made the Deadblow buffer I make, I have not had a single out of battery experience in any of my blowback PCC's and this is over tens of thousands of rounds annually over a space of several years. |
|
|
|
Posted: 7/29/2020 9:45:44 AM EDT
[#13]
What is the heaviest buffer produced for a 9mm?
|
|
|
|
Posted: 7/29/2020 9:57:39 AM EDT
[#14]
Quote HistoryQuoted: What is the heaviest buffer produced for a 9mm? Quote HistoryQuoted: What is the heaviest buffer produced for a 9mm? From Lots of 9mm AR blowback tuning info without having to search for it. Buffer weight examples These are just a few examples of various buffer weights (as advertised, all weights approximate). Some are solid, some have sliding internal weights that help prevent bolt bounce, and some use elaborate designs and materials to reduce perceived recoil. Some are standard carbine buffer length (~3.25") and need a buffer spacer, others are extended length (~4"). 6.5 - 8.5oz. is generally considered the "sweet spot" buffer weight range for most 9mm simple blowbacks. Not for 9mm, for comparison only: 3.0 oz. - 5.56 standard carbine 3.7 oz. - 5.56 H1 carbine 4.6 oz. - 5.56 H2 carbine 5.2 oz. - 5.56 rifle-length buffer May work for a 9mm simple blowback setup: 5.5 oz. - 9mm carbine (solid, carbine) 5.5 oz. - Bravo Company H3 carbine (sliding weight, carbine) 5.5 oz. - Blitzkrieg elastomeric 6.0 oz. - Blitzkrieg hydraulic 6.1 oz. - Vltor A5H3 (sliding weight, extended) 6.5 oz. - Slash’s HSS Tungsten (sliding weight, carbine) 6.8 oz. - Vltor A5H4 (sliding weight, extended) 7.5 oz. - Macon Armory (sliding weight, extended) 7.5 oz. - Kaw Valley Precision (solid, extended) 7.7 oz. - Spikes tactical st-9x (solid, extended) 8.0 oz. - KAK Industries (solid, extended) 8.5 oz. - Slash’s 9mm-Q Buffer (solid, extended) 10.0 oz. - KAK Industries (sliding weight, extended) 10.0 oz. - Kaw valley Precision (sliding weight, extended) 12.0 oz. - Slash’s 9Q-T (sliding weight, extended) The Slash's 12oz. Is the heaviest I have found. |
|
|
|
Posted: 7/29/2020 7:43:17 PM EDT
[#15]
Quote HistoryQuoted: JP SCS lowers the mass of bolt buffer system , and compensates with springs.....not a good idea in my opinion. At the end of the day, no substitute for mass in a blowback gun. Since I made the Deadblow buffer I make, I have not had a single out of battery experience in any of my blowback PCC's and this is over tens of thousands of rounds annually over a space of several years. Quote HistoryQuoted: Quoted: I’m considering the JP SCS system. I’ve shot a JP rifle wit was really smooth JP SCS lowers the mass of bolt buffer system , and compensates with springs.....not a good idea in my opinion. At the end of the day, no substitute for mass in a blowback gun. Since I made the Deadblow buffer I make, I have not had a single out of battery experience in any of my blowback PCC's and this is over tens of thousands of rounds annually over a space of several years. Humm, what spring do you use? Does the buffer still need a spacer? Does it come at max weight? |
|
|
|
Posted: 7/30/2020 12:53:37 AM EDT
[#16]
Quote HistoryQuoted: Humm, what spring do you use? Does the buffer still need a spacer? Does it come at max weight? I use a standard carbine spring.....no need for a spacer, the buffer is sized for a blowback system. |
|
|
|
Posted: 7/30/2020 12:55:46 AM EDT
[#17]
Quote HistoryQuoted: What is the heaviest buffer produced for a 9mm? I have found 7.5 to 7.7 ounces to be optimal in my guns......heavy enough to dampen recoil (especially with the deadblow effect) yet not so heavy that the bolt cycles slower than I can pull the trigger..... |
|
|
|
Posted: 7/30/2020 6:58:36 AM EDT
[#18]
Quote HistoryQuoted: I have found 7.5 to 7.7 ounces to be optimal in my guns......heavy enough to dampen recoil (especially with the deadblow effect) yet not so heavy that the bolt cycles slower than I can pull the trigger..... Thanks |
|
|
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.
