Discussion in 'Rifle Country' started by kwelz, Feb 28, 2005.
Oh and here is the nice shiney new M4
Sorry, I don't know what the problem would be, besides a chamber issue or ill-loaded ammo? Is the ammo surplus?
The same stuff I am sure most of us use. I prefer it for break in. Culd be a bad round. However after I saw it I decided to hold off any more shooting till I got a second opinion.
Paid 850 for it in Box. Marked LE only too
I would NOT shoot any more of that ammo lot. Try another lot/brand and see what happens. I suspect that you'l find the symptom goes away.
I think I found the problem.
Never seen headspace that excessive...
Get it checked.
Honestly the only people I see complain about DPMS are the Colt/Bushmaster/Armalite Fans on the internet. Everyone around here who has one seems to love it and while this is my first complete DPMS I have always been very happy with thier uppers before.
Yeah, I didn't think that one all the way thru.
Having said that, I've never seen headpsace THAT bad. In the past when I've seen this, it was always a case of premature unlocking in a semi-auto. Given the AR reference, I presumed that it was a mismatch between the ammo and gas system and recoil system.
There's excessive headspace...
And then there are oversized chambers. Don't confuse the two. You can have a chamber cut that's properly headspaced, boltface to shoulder datum point, but still very much oversize in case diameter dimensions, which is NOT a headspace issue. Chambering reamers that wobble and don't stay concentric to the bore can do that. Without an unfired round for comparison, it's hard to tell whether the shoulder was bumped forward any on that particular piece of brass. Bulged above the case head, yes, but what else is going on in there? Good to know DPMS will make the necessary changes, though.
I have a friend that shoots a lot of High Power. Had a friend with an AR that was pulling the heads off cases. Called RRA. Their first question was "are you using Remington cases?"
I'd maybe try ONE round of military or Winchester ammo and check over the case real well. Be real interested in your findings as I'm picking up my AR in a few weeks.
Somebody edumacate me...
Azizza, were DPMS and Kieslers able to see your pictures? Please keep us posted, inquiring minds-------
I believe most quality firearms nowadays are made via CNC. But then, it is DPMS. I don't know how they do it.
How so? I would expect that a wobble in the reamer would introduce a taper into the blown-out section, but that's not apparent in the pics.
I wonder if the chamber was cut too shallow and the barrel not screwed in as far to compensate and correct the headspace. That would theoretically allow the case to be unsupported just above the head. But I admit that I'm talking out of my a$$ here, since (at a minimum) I don't really know how the AR barrel is screwed into the receiver....
the barrel on an AR is not screwed into the receiver.
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