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+--- Thread: Dimpled Primers (/showthread.php?tid=372)
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Dimpled Primers - warped - 06-10-2011
LRRPF52 Wrote:I've never had this problem, and can really only see it happening with primers not seated deeply and/or the soft primers as mentioned. Feel free to drop the BCG from a locked position on your AR, as long as you have reputable factory ammo, or well quality-controlled hand loads. I eye-ball my hand loads, and prime on the press firmly. All my friends use hand primers, but I prefer priming on the press for some reason...then looking at each case head from the side against the light to ensure there is no primer protrusion.
Also, think about your used cases and especially if you're running them pretty hard, after a few reloads, what happens to primer pockets? Now, lets' say that I seat some really loose primer pockets that don't dislodge when I bang the rim at an angle on my bench, but will that be true with them under recoil in the magazine.........?
Then, loose-pocketed rotten socket perhaps ends up with a protruding primer....gets cycled into battery.....almost.....kaboom!
This is a scenario I have wondered about, which could bypass my QC techniques for primer seating. Who knows? I know I've seated some that gave no resistance, and left me with a very not so warm and fuzzy...
LRRPF52
I saw some cops last year easing the bolt forward after the bolt was locked back, I could not think of why they would ever do such a thing.
I am sure that you and I, Gene and some of the others have probably shot a mountain of ammo from this platform without a slamfire.
Of course we practice muzzle discipline as well so even if it did such a thing, we would not be killing anyone nor destroying something important.
I have recently had some primers go in with virtually no perceived force. The others in the same batch took a bit, regardless I looked quickly at each one as I filled magazines.
Heck I even found that I had three with no primer which is strange because I kept the primer feeder full and have a warning sensor.
I am really considering hand priming anyways.
Dimpled Primers - LRRPF52 - 06-10-2011
Warped,
I've done a CQM range before where I literally fired over 1,100 rounds in less than two hours, and they were all on-target (FBI silhouettes). Actually, my avatar pic is of that particular range/day I'm speaking of, and one of the guys that was running it had burnt 10,000 rounds through his M4A1 the day before, after tossing his previous upper and getting the "New" one, which he took to bolt service life in one day. With all the civilian AR's, M16A1's, M16A2, M4's, and M4A1's I've burnt ammo through, I never had a slam-fire, and all my range sessions have usually been no less than 300 rounds on the civilian side. I've never had a slam-fire with a Garand, M14, M1 carbine, or M1A either.
It was more common on the early Armalite AR15's that had a larger firing pin head, which had a lot of mass to it. As they transitioned from the prototypes to the Colt Model 601 (first Colt-made military AR15 with Green painted furniture over the bakelite, chrome BCG, slickside upper/lower) and Colt Model 602 (all black, still "slickside", 1/12 rifling, no chrome bore anymore), they kept the large head firing pin, and as a result of the evaluations and incidents of slam fires with those, they went to the lighter firing pin on the XM16E1 in 1964, which is still the current design.
HK used a firing pin spring and safety plunger on the 416 & 417, but that is classic over-engineering (the plunger). I do like the firing pin spring design on the current Armalite AR10's, but in practice, the floating pins with lighter weights have not been a problem. You can also buy a Titanium firing pin, but the tips have supposedly galled on them when used in AUTO guns.
LRRPF52
Dimpled Primers - warped - 06-11-2011
Yes, this has been similar to my experience.
Last year we tested an AR15 in 5.56mm that ran 4k rounds before a stoppage.
This is not that impressive but what it is that it was a DI rifle and it was suppressed the entire time.
If that did not cause a slam fire what will?
That was the filthiest rifle anyone would ever see.