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ISO 300
by Turkey08 - 05/19/25 09:32 AM
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Joined: Mar 2008
Posts: 26,325
Freak of Nature
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Freak of Nature
Joined: Mar 2008
Posts: 26,325 |
I've had an M1A slam fire for about 5 rounds...high pucker factor.
Last edited by Skullworks; 01/23/18 07:40 AM.
"I'm not near as critical about how big they are as I once was. Smiles are more important now! We will grow more deer."
Jimmy G.
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Joined: Aug 2017
Posts: 26
spike
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spike
Joined: Aug 2017
Posts: 26 |
Normal. I have the same gun and does the same thing. Scared me too and took it to gunsmith. Said it was absolutely normal
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Joined: Jan 2015
Posts: 2,598
10 point
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10 point
Joined: Jan 2015
Posts: 2,598 |
Thats very common on all my ar type rifles. Its the floating firing pin. If you put a magazine in and chamber and extract a round they all have that tiny dot from the firing pin. All mine do. Research more online to ease your mind though. normal when bolt slams shut the firing pin freefloats ( doesnt have a spring to keep it held back) its not near enough to set that primer off . Every AR platform rifle ever made will do it Not every AR platform! Does not happen on my AR 10 or my newer M-4 .223 platform.
Last edited by Groundhawg; 01/23/18 01:50 PM.
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Joined: Oct 2008
Posts: 31,221
Grumpy Old Man
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Grumpy Old Man
Joined: Oct 2008
Posts: 31,221 |
ARs chambered in 5.56 are less likely to scar the primer due to machining.
Those chambered in 223 probably will scar the primer because of the tighter tolerance.
My AR 10 also scars the primers, just like that.
It isn't a safety concern, for me.
That being said, if it's a safety concern, for you, then you should definitely get a gunsmith to look at it.
Last edited by Out back; 01/23/18 12:37 PM.
My opinions and comments are my own. They do not reflect the position or political opinions of Aldeer or any of the Aldeer administration.
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Joined: Jul 2015
Posts: 231
4 point
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4 point
Joined: Jul 2015
Posts: 231 |
The firing pin of the AR platform is a free floating pin. It's pretty normal, and I'd be more surprised about it not happening. That said, I chambered the same 4-5 rounds over the course of about 3 months, nearly every day in a turd-world-country... see what I did there... before I was advised not to, but the reasoning from the old crusty sergeant was that it could eventually misfire. Doc Roberts, who is one of the foremost minds on the subject of ballistics and wounding had this to say in his research: "A large SWAT team here had a failure to fire from an M4 with Hornady TAP ammo during an entry--fortunately no officers were hurt and the suspect immediately threw down his weapon when the carbine went click instead of bang. After the incident was concluded, the team went to the range and expended the rest of their carbine ammo and had one additional failure to fire. This same team had 3 Hornady TAP rounds fail to fire in training a couple of years ago. Last year, when Pat Rogers was teaching a class at a nearby agency, there were 5 failures to fire using Hornady TAP ammo. In all 10 cases, there appeared to be good primer strikes, but no rounds fired. On analysis, the ammunition had powder and checked out otherwise. However, two problems were discovered. First, some of the primer strikes had insufficient firing pin indentations. The round from the potential OIS incident had a primer strike of only .013"the minimum firing pin indent for ignition is .017". In addition, the primers on the other rounds were discovered to have been damaged from repeated chambering. When the same cartridge is repeatedly chambered in the AR15, the floating firing pin lightly taps the primer; with repeated taps, the primer compound gets crushed, resulting in inadequate ignition characteristics--despite what appears to be a normal firing pin impression."The resulting answer is, you're not going to have problems with it misfiring, but you're going to have issues with it NOT firing after as the primer doesn't ignite as it should. Source: DOCGKR (doc Roberts) http://www.lightfighter.net/topic/5-56-mm-duty-loads
Last edited by dreadpiratebob; 01/24/18 05:43 AM.
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