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Started By
Message
AR rounds look like the primer was struck by firing pin.
Posted on 9/6/24 at 10:18 pm
Posted on 9/6/24 at 10:18 pm
I’m still not an ar expert so you’ll laugh at this.
I tried this on all three Ars tonight.
I was pulling the charging handle back in my new rifle and loading to the chamber.
I looked at the round and noticed that the primer looked slightly struck.
I tried it again and saw the second bullet was slightly struck as well.
I thought it would be a good idea to do this on the other two rifles.
All were on safe.
But all seven rounds looked the same as compared to a bullet that was not struck at all. It was never chambered.
FYI these were .223 but I don’t think it would make a difference.
Have not tried this on my 556 bullets yet.
Obviously this is natural right? Does the printer get they close to an I fired round?
I tried this on all three Ars tonight.
I was pulling the charging handle back in my new rifle and loading to the chamber.
I looked at the round and noticed that the primer looked slightly struck.
I tried it again and saw the second bullet was slightly struck as well.
I thought it would be a good idea to do this on the other two rifles.
All were on safe.
But all seven rounds looked the same as compared to a bullet that was not struck at all. It was never chambered.
FYI these were .223 but I don’t think it would make a difference.
Have not tried this on my 556 bullets yet.
Obviously this is natural right? Does the printer get they close to an I fired round?
3
Posted on 9/6/24 at 10:33 pm to dstone12
Guessing the firing pin is making contact with the primer when the bolt closes but not hard enough to cause it to fire.
Never noticed any of mine doing that though.
Never noticed any of mine doing that though.
Posted on 9/6/24 at 10:39 pm to dstone12
Well yeah, the AR's use a floating firing pin. That's why you use a gauge to measure firing pin protrusion (.028" - 0.035") and also why it's ideal to use military hard primers to reload .223 when it's intended to be shot out of a semi-auto like the AR-15.
Posted on 9/6/24 at 11:10 pm to Clames
Well you know what the next question is going to be.
When you let the charging handle go full speed to chamber the round is that floating fire firing pin ever going to have the chance to make a round go off?
When you let the charging handle go full speed to chamber the round is that floating fire firing pin ever going to have the chance to make a round go off?
Posted on 9/6/24 at 11:31 pm to dstone12
It's possible to slam fire them. Dropping a round in the chamber and then letting the bolt slam on it full speed with a soft or not fully seated primer can do it. Stripping rounds from the magazine slows the bolt down enough to keep it from happening in normal use.
Posted on 9/7/24 at 6:00 am to Clames
quote:
Well yeah, the AR's use a floating firing pin
Yeah, this is a known thing with AR's. Very common from my experience and research. You should always be pointing a gun in a safe direction, so the point is moot, but I definitely keep it in mind when releasing the charging handle. Actually brought up the concern of using a particular primer on .223 reloaded rounds in my new to reloading thread for this very reason.
Posted on 9/7/24 at 7:21 am to dstone12
quote:
When you let the charging handle go full speed to chamber the round is that floating fire firing pin ever going to have the chance to make a round go off?
Can't say it NEVER happens, but thats why we have rules for firearms.
It's really not even a thought in my mind though. Zero concern from me.
Posted on 9/7/24 at 7:30 am to kengel2
Scared the shite out of me when I saw it.
Zoom in on one of those primers. It’s enough have me wonder about a primer that sits back one mm.
Bang.
New question. Are these seven primers affected in any way?
Zoom in on one of those primers. It’s enough have me wonder about a primer that sits back one mm.
Bang.
New question. Are these seven primers affected in any way?
This post was edited on 9/7/24 at 7:31 am
Posted on 9/7/24 at 8:03 am to dstone12
quote:
wonder about a primer that sits back one mm.
If I'm not mistaken, it's more about the weight of the firing pin having enough energy. There's nothing stopping the firing pin from protruding as much as it does during actual firing. It's free floating. The only difference is the hammer pushing it harder vs. inertia from the slam.
Posted on 9/7/24 at 11:44 am to dstone12
Ya, it's just free floating, not enough force to set it off.
And if your primer is not seated all the way it probably won't feed.
And if your primer is not seated all the way it probably won't feed.
Posted on 9/7/24 at 2:34 pm to kengel2
quote:
And if your primer is not seated all the way it probably won't feed.
It will certainly feed, enough force in the drive spring to even chamber a bent round and fire it if needed. Bolt face will easily push the primer in.
Posted on 9/7/24 at 7:48 pm to dstone12
As others have said...floating firing pin.
I've personally put several hundred thousand rounds of 5.56mm through various M4 variants, and have witnessed several million rounds fired through them by others, and I've never seen one slam fire.
I've personally put several hundred thousand rounds of 5.56mm through various M4 variants, and have witnessed several million rounds fired through them by others, and I've never seen one slam fire.
Posted on 9/8/24 at 10:57 am to Longhorn Actual
Incredibly rare. When I started doing reloading for my AR's I tested bullet setback at the range. I tested my loads vs mil-issued M855, chambering one example of each type into my rifles ten times and recorded the change on OAL with a precision micrometer. I used a military-type crimping die for my stuff so there was no significant difference but I had the same dimpling of the primers. My rifles have 0.032" protrusion of the firing pin, the dimpling didn't progress past what occured with the initial chambering which is very shallow compared to an actual primer strike.
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