User Panel
User Panel
User Panel
|
Posted: 9/9/2005 1:16:17 PM EDT
[#1]
slam fire?
|
|
|
|
Posted: 9/9/2005 1:27:16 PM EDT
[#2]
Sounds like it. |
|
|
|
|
Posted: 9/9/2005 1:30:28 PM EDT
[#3]
that is definetly a slam fire..........disassemble the bolt carrier assy and clean it, especially the bolt itself where the firing pin goes into, the firing pin isn't freely moving......some junk, carbon or gease is the cause........the other possibilty might be the firing pin might be bent.
|
|
|
|
Posted: 9/9/2005 1:36:02 PM EDT
[#4]
Third posibility (though very rare w/factory ammo), a projecting primer. Most often occurs w/handloads, but every once in awhile I have seen a factory round w/one. 
|
|
|
|
|
Posted: 9/9/2005 5:31:42 PM EDT
[#5]
Did the case have a firing pin dimple after it shot? If not then the primer was high and sensitive to the bolt face, if it had a definate firing pin dimple then the firing pin stuck for some reason.
|
|
|
|
Posted: 9/9/2005 5:44:42 PM EDT
[#6]
This is why it is taught to ALWAYS keep weapon pointed down range. I wouldn't worry at all, unless it happens a lot. Probably the ammo's fault. It might scare you, but it's good for a laugh as long as your using proper safety precautions. It seems like you know what your doing, you didn't kill anyone.
 If i woulda been there, I woulda LMAO!!! 
|
|
|
|
Posted: 9/9/2005 5:51:08 PM EDT
[#7]
You shouldn't be chambering a round unless the weapon is pointed down range!
At the regulated range I go to most often, weapons are pointed down range unless and until they are put in a case to be carried off the line. I know you are only asking a tech question concerning why this may have happened with your rifle. But it's important and affects all of us since everything any target shooter or hunter does affects public opinion of shooting. Be safe. Good shooting. |
|
|
|
Posted: 9/9/2005 6:17:45 PM EDT
[#8]
Good advice. |
|
|
|
|
Posted: 9/9/2005 6:22:33 PM EDT
[#9]
guys, it sounds like the weapon WAS pointed downrange.
Make absolutely sure you take the bolt apart and the extractor off and clean and inspect the firing pin channel. |
|
|
|
Posted: 9/9/2005 6:28:36 PM EDT
[#10]
anybody remember this one?
Their are two types of people: Those that have had AD's, and those who are about to. |
|
|
|
Posted: 9/9/2005 10:57:53 PM EDT
[#11]
+1 on both posts! Check out what they said and you'll be good to go. After checking everything out, UNDER SIMILAR SAFE CONDITIONS, try loading a round again via the bolt release. Just to be sure it does not happen again and that the rifle is working as it should. Stay safe and glad nothing serious came out of it. |
||
|
|
|
Posted: 9/9/2005 11:39:49 PM EDT
[#12]
Probably NOT a high primer or a slam fire but a bounce fire. The shock of the action caused the sear to bounce, preventing engagement.
What ever it was, it wasn't an out of battery experience. |
|
|
|
Posted: 9/10/2005 12:38:45 AM EDT
[#13]
possible cook-off after 6x30 rds? |
|
|
|
|
Posted: 9/10/2005 12:50:51 AM EDT
[#14]
re: cookoff, that's what I was thinking. Another round should have chambered if so.
eta:
|
|
|
|
|
Posted: 9/10/2005 12:57:28 AM EDT
[#15]
Had to have been the M16 carrier.
ETA: its a joke |
|
|
|
Posted: 9/10/2005 1:11:09 AM EDT
[#16]
I doubt it was as cookoff. I have never heard of an instant cookoff when a round was chambered. |
||
|
|
|
Posted: 9/10/2005 4:56:17 AM EDT
[#17]
It should take a lot more than 150 rounds of semi-auto to make the rifle hot enough to cook off a round. A LOT MORE!
I don't think it was a cook off. Probably stuck firing pin or a sear bounce. Either way, CLEAN, CLEAN, CLEAN the rifle to keep it from sticking the pin, and clean the lower really well too, because gunk can interfere with the FCG's operation as well. |
|
|
|
Posted: 9/10/2005 1:11:30 PM EDT
[#18]
I believe it's more a matter of rate of fire vice number of rounds to reach cook off temperature. It took less than four magazines to cook off some blanks during training (of course, this was auto fire).
|
|
|
|
Posted: 9/10/2005 1:32:29 PM EDT
[#19]
Had the round that was chambered been repeatedly cycled previously?if so every time a round gets chambered the firing pin makes a tiny dent.Over the course of repeated chamberings it can eventually go off when chambered.
|
|
|
|
Posted: 9/10/2005 3:51:13 PM EDT
[#20]
If he had a non-modified M-16 firing pin in there it 'may' have contributed to the accidental firing. An M-16 firing pin has a little more mass to it and does tend to smack the primer with a little more force then an AR-15 firing pin. A non-modified M-16 bolt carrier is also more prone to slam fires... There is a reason that Colt and others have cut and modified the AR-15 bolt carriers near the firing pin. (To help prevent slam fires) |
|
|
|
|
Posted: 9/10/2005 4:01:12 PM EDT
[#21]
I had a sear engagement problem that caused this very same situation. I had to replace the trigger and the hammer to fix it.
Bob |
|
|
|
Posted: 9/10/2005 5:55:40 PM EDT
[#22]
I am always amazed at the number of people who are clueless on a subject but feel the need to express thier opinion anyway.
|
|
|
|
Posted: 9/10/2005 6:02:53 PM EDT
[#23]
Who is clueless? 
|
|
|
|
|
Posted: 9/10/2005 6:15:33 PM EDT
[#24]
cms81586
Great Post, thanks for the eye opener, we can all use a reminder now and again. I've never had a slam fine on an AR as yet. Emphasis on YET. myit |
|
|
|
Posted: 9/10/2005 8:07:59 PM EDT
[#25]
Very true, if you always prepare for them a take the proper measures, follow the 4 basic rules, its a good percentage, everything should be ok. |
|
|
|
|
Posted: 9/10/2005 8:17:03 PM EDT
[#26]
I always thought they threw the notched hammer and cut carrier to prevent the rifle from going full-auto. On purpose or not. WIZZO |
||
|
|
|
Posted: 9/10/2005 10:40:22 PM EDT
[#27]
It sounds like a slam fire to me. But I'm an idiot.
|
|
|
|
Posted: 9/10/2005 11:45:21 PM EDT
[#28]
+1 on the good advice. ps. this must be blue mountain right? |
|
|
|
|
Posted: 9/11/2005 2:51:12 AM EDT
[#29]
Caused by the same thing. You do loose a little of the safety designed into the SP1 system of parts by using the "enhanced" style carriers and unnotched hammers. But I have seen SP1 parts not catch the hammer when it should have 100% of the time. I also had a lower not to long age that had the trigger hole drilled .02" to low on the receiver and the carrier did not push the hammer down far enough to catch the disconnector. It caused an occasional slam fire if you held the trigger to long after firing. |
|
|
|
|
Posted: 9/11/2005 6:23:23 AM EDT
[#30]
Most interesting J3_. Can you tell us more?
|
|
|
|
Posted: 9/11/2005 8:55:53 AM EDT
[#31]
About what? |
|
|
|
|
Posted: 9/11/2005 4:43:55 PM EDT
[#32]
About this: "You do loose a little of the safety designed into the SP1 system of parts by using the "enhanced" style carriers and unnotched hammers."
I am intrigued about the fact that the enhanced bolts may have left some issues behind.... I'd like to build safer ARs. Also, this would seem to indicated that a heavier buffer may be better than a heavier bolt. |
|
|
|
Posted: 9/11/2005 4:54:58 PM EDT
[#33]
A non modified carrier more prone to slam fires,I guess M16s should be redesigned to use cut carriers then.Not for nothing but I think thats BS larger collar firing pin and full auto carrier makes weight increase minute.I run a 9mm buffer in my rifle and have a shrouded carrier with a notched hammer.No slam fires..and I have never had one in the 13 years I have had the rifle.Maybe the ammos primer was not as hard as it should be or maybe the round had been cycled many times before wich can discharge as the firing pin does make a small dent but so dosent my garand and M14 types....all have floating firing pins.I dont think its the carrier or the pin unless the hammer is riding the carrier as it goes into battery.The notched hammer and machined shroud on the carrier is so the hammer will hang up on the carrier in case the disconector breaks or is removed on purpose.If M16 carriers and firing pins were more prone to slam fires wouldnt something have been done design wise in the last 40 years to correct this.Maybe its the parts or the receiver holes that are out of spec thats causing the problem.Hell Colt sends their carbines with M16 carriers and my L&W conversion also came with one....no slam fires.
|
|
|
|
Posted: 9/11/2005 6:57:31 PM EDT
[#34]
The firing pin can't project unless the bolt is rotated (in battery).
High primer, it would have popped the primer as the bolt hit it, before the bolt rotated and locked, resulting in a kaboom. You did not have a kaboom, it appears, as you did not mention the mag blowing out of the mag well, the sides of the receivers bulging, etc. It was not a high primer. A cookoff can't happen immediately, it takes time for the heat to soak in and heat it up to such a temp as to light it off. This is why, after firing a long string, a belt, several mags, you are instructed to open the bolt, eject the chambered round. Besides, you did not fire enough semiauto to get there. Most likely the hammer bounced off the trigger for some reason. Perhaps insufficient sear engagement. A piece of primer could have fallen into the sear notch preventing full sear engagement. A loose primer could have been down in the receiver, UNDER the rear of the trigger, preventing the trigger from returning to full forward position and thus, full engagement. Or worn sear. It is in the hammer/trigger area you need to be concerned with. Look at the ejected brass (all of it) for a missing primer. Questions? Comments? Buehler? Anyone? Buehler? |
|
|
|
Posted: 9/11/2005 7:51:52 PM EDT
[#35]
Did you have your finger on the trigger when it went off?
|
|
|
|
Posted: 9/11/2005 8:02:10 PM EDT
[#36]
I think its George Bush's Fault
Seriously read What A_Free_Man Said |
|
|
|
Posted: 9/11/2005 8:17:42 PM EDT
[#37]
Thank you resq944. It is good to know that at least one person here recognizes my genius in such things, even if I do tend to piss off LEO's with my no compromises position on the 2nd Amendment (AND the Constitution and Freedom as a whole). 
|
|
|
|
|
Posted: 9/11/2005 9:03:34 PM EDT
[#38]
|
|
|
|
|
Posted: 9/11/2005 9:55:08 PM EDT
[#39]
Wait a second....before you pat yourself on the back, did you get David_Hineline's endorsement of your opinion before posting it?? Otherwise, you're not qualified to have an opinion. 
|
||
|
|
|
Posted: 9/11/2005 10:09:08 PM EDT
[#40]
Bueller
|
|
|
|
|
Posted: 9/11/2005 10:33:29 PM EDT
[#41]
If your finger didn't pull the trigger, I feel the sear needs a look at. The firing pin rotates in the bolt, can't be a slam fire like M1 garands are known for.
|
|
|
|
Posted: 9/12/2005 12:53:31 AM EDT
[#42]
It is possible for it to fire without rotating into battery. . If the cam pin is left out during reassembly. Thats why the warning is in the manual. page 2-37
Wiley Coyote was a genius too.
|
||
|
|
|
Posted: 9/12/2005 6:51:36 AM EDT
[#43]
That is a very good point. And for you history buffs the AR-15 (as in Model 01) did suffer excessive "slam fires" in the early 1960's. The fix was a much lighter firing pin. Even so, with any design there will be instances of a round going off simply by chambering, just a matter of time and use. As pun pointed out, the current design holds such occurrences to an acceptable level. In this particular case I would not rule out a cook off. |
|
|
|
|
Posted: 9/12/2005 12:25:09 PM EDT
[#44]
Yes, but I have never seen or heard of a cookoff being instantaneous. And as a previous poster pointed out, when they do cookoff, it is bam... bam... bam... bam... , not full auto rate.
The AR was fired before and after without it blowing up... the cam pin was in. My vote is still with a worn sear (hammer or trigger), or piece of trash, primer, anvil, caught in the hammer/trigger or under the rear of the trigger. No matter what the cause... this guy showed proper safety, the rifle pointed safely downrange (or up) when chambering a round). I am sure he is not careless, and he engaged in normal operation the same as all of us had. This AD could have happened to any one of us, me, you, any of us. It is not his fault, the manufacturer's fault, the ammo maker's fault. It is the nature of what we are operating. Learn from this. |
|
|
|
Posted: 9/13/2005 2:37:22 PM EDT
[#45]
Forgot to mention that the rnd that went off didn't eject all of the way...it stove-piped in the ejection port. I finished that mag and then dissassembled the rifle. Nothing appeared amiss, and the cam pin was it...(didn't have any extra parts after i cleaned it...
). I doubt it was a cook off. The mags I went through before hand were all aimed rapid fire (one shot every 2-3 seconds). I wasn't bump firing or anything. No clue how it happened but just tryin to remind ya'll to stay safe.
|
|
|
|
Posted: 9/13/2005 2:46:15 PM EDT
[#46]
It is just possible to have a slam fire sometimes. The chances are extremely minute, but the chance *is* there. That's why I've argued in other threads against storing your gun with the bolt locked back and a magazine inserted. If it gets jarred and the bolt slams home it might slamfire. I know the chances are extremely low, but it would suck if you were the one guy to get killed by your own gun sitting on the other side of the room.
|
|
|
|
Posted: 9/14/2005 3:04:44 AM EDT
[#47]
...
|
|
|
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.
