You are correct. The Shield isn't a DAO and doesn't have a second strike capability.

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Possibly a sqiub load followed by another round causing the barrel to swell, locking the slide? Just prior to that occurring did you hear a louder than usual BOOM?


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My post 28 describes the same procedure, but the armor's way is better because you don't need a vise and your hand is well clear of the barrel. I'll remember that. That round looks awful. Glad you got some help. Good thread. We learned somethihng.

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This was the last round in the clip, and no, it wasn’t a squib load. The case was full of unspent powder, so the lack of a flash hole prevented any spark from getting past the primer pocket and into the case. The primer just backflowed and swelled the case enough to get it firmly jammed in the chamber.

I personally think this was a slam-fire caused by the protruding primer, and I didn’t know it because the gun was in recoil from the previous round. That’s the only thing that makes sense to me - otherwise, how did the primer fire and backflow without my knowing it? When I pulled the trigger on that round I felt or heard nothing, so the primer must have already fired...

Is this worth taking a chance of an accidental discharge? Trying to push a round back down the barrel against possibly the striker? Sounds better to let a professional armorer check it out.

I agree with the theory several others put forth that the picture shows a used (fired) primer that did not get pushed all the way out during sizing/depriming, a step in the reloading process, and the used primer stayed with the case through the next steps in the process of receiving powder and a bullet.

That is, the mark is that of a striker or firing pin that hit the primer and indented it, then was flattened during depriming (e.g., when pushed from the inside). That made it look like a "glob." But the shape is distinctive...

If I (and a few others, above, are right about this) it meant the bullet could not be fired, which is luckily good, but not something you would know while the gun was locked tight. But if you took the round apart, you would find powder but a dead (used, with blackened anvil) primer.

Interesting case, helpful responses, and a good lesson in the fallibility of ammo. For self-defense carry ammo, I'm inclined to believe each round should be inspected before loading in the mags, and only reputable manufacturers should be used!

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S&W Rover

Great theory, Rover, but that blob definitely IS a blob with what looks like a firing pin strike in the middle of it. It’s raised from the surface of the primer; my fingernail catches on it when I drag it across the primer. That’s why I think the primer was not fully seated and caused a slam-fire. There was no place for the primer flash to go, so it backflowed and melted a bit of the primer creating the blob.

Either that or, like you say, that was a spent primer to begin with. It was supposedly “factory new” ammo though - how could a spent, blown primer end up in the “new” manufacturing process?

I dunno, and I guess we never will know...

Why is this continuing. Clearly the bullet was removed. There was unburned powder. The bottom of the case clearly showed either the case never had a flash hole drilled, OR the primer never had a flash hole in it.

Clearly the primer was struck and the primer exploded, with no where for the primer to expens the enedyinto the case, since there was no flash hole. That energy had to go somewhere. It appears it both backed up the primer and also melted through the rear of rhe lrimer at the weakest point which was the indent where the striker indented the primer. The blob was the residue of the primer and perhaps small amount of melted metal from the primer or even melted brass from the base of the undrilled case.

There is little mystery here what so ever. The only mystery is how QC of whoever made the case and/or the primer could have not rejected this round or primer. But when manufacturing thousands and thousands of rounds, there is bound to have a random flaw get missed.

I think the entire episode proves that something that went very wrong at least resulted in the shooter not being injured in any way. Sure the slode was “stuck” and required effort to free up. But I think that is a small lrice to pay for the safety of the situation.

Flying fool, you’re right...clearly the primer was struck and exploded. The only mystery remaining for me is, when did that happen? I’m sure it didn’t happen when I pulled the trigger on that round or I would have known it. That only leaves a slam-fire, doesn’t it? What other possibilities are there?

I agree, there is no point in continuing this discussion. I think we all learned the importance of inspecting factory ammo before feeding it to your gun, though I’m not sure even a close visual inspection would have caught this one...

Exactly right - no way for the factory to have caught it either - unless they are visually inspecting the flash hole in every piece of brass before loading. Never gonna happen - unless you want to start paying 50 cents a round for 9mm - and even more for most every other caliber (since 9mm is the cheapest of all center fire calibers)....

None of us were there. Time to kick this pig off the porch . . .

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