you can call BS, but the whole issue came about because of instances in the field were rechambered rounds WERENT firing. it’s pretty much fact, ma’man.
how many times you can chamber a round is a question- but there’s no question that rechambering the same round in an AR can damage the primer to the point that it wont fire.
You can call bullshit all you want to but the facts came from a highly respected member of the LE community who is also an Industry Professional here as well. I agree that one time chambering will not likely cause a FTF and all of the rounds I have removed from duty use after a rechamber have gone bang in training. But why take the chance. And stating that the primer dimple will not cause the round to not fire is incorrect as field experience with several departments as well as the one listed in the article has shown that it can cause a FTF.
This is a normal question and it’s a very normal thing to occur with ARs.
In 20 yrs, I’ve never seen a AR that didn’t do this.
I’m a member at 10-8 and saw Doc Roberts posting about the round of Hornady TAP (and other examples) where a cartridge, if chambered repeatedly, can fail to fire. I do not doubt that this occurred, not one bit.
Can it occur? Yes. Will it always occur? No.
I tested this with a round of Federal 62 grn TB. Federal primers are well known to be more sensitive/softer than other primers.
I chambered the same round 50 times, keeping the muzzle downrange in case of a slamfire, etc. On the 51st time, I fired the cartridge into a berm, no problem.
Like others have said, change out that round every 5th chambering, or thereabouts, to reduce the chance of this causing you a bigger problem.
There is a saying in the science community that “with enough time and opportunity anything that can happen will happen”. Given that there are millions of people in the military, law enforcement, and civilians, firing billions of rounds of ammunition in the M-16/AR-15 series of weapons. I would say not only is it possible but probable that it has happened.