Ar-15 jammed with live round!!

Yowza.

No, I don't think that happens often. I've heard of it happening before, but I've never seen it.

Welcome to the one-in-a-million malfunction club.
 
This type of jam occurs more often than one might think. Saw two of them last year at one of the local firing ranges. Not sure why the case neck separates.
 
Head space anyone?

:):):)I would think that the prudent thing to do is gauge check this rifle. I would want to see if the chamber would swallow a no-go gauge. I am hearing that a case split in two leaving the front part in the chamber to jam the next round. Also your not using junk ammo so I think it's time to check the head space.

Buzzard Bait
 
I don't think there is a headspace problem. True, excess headspace can cause case separation, but at the rear, just ahead of the solid base, not at the case neck. The case neck breaking off is usually due to bad brass or to something like too tight a crimp or the wrong kind of sealant. Another possible problem is too small a chamber neck, not allowing the case neck to expand properly. When one of those conditions exists, part of the case neck breaks off and usually goes along with the bullet out the barrel. In this case it stayed in the chamber neck and jammed the next round.

Jim
 
Been there done that

AR's require "Small Based" dies for sizing, if your barrel is marked 5.56 I would stick with cases so marked, if your barrel is marked 223 then stay away from any ammo marked 5.56. Since it was Wal-Mart ammo I would suspect it was 223 and should have worked in your rifle. However most commercial ammo is manufactured for Bolt action rifles which have different specs. The manufactures are more concerned with million round orders for the army than with us poor slobs that buy 50 or 100 rounds at a time.


Good luck.

Jim243
 
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