There seems to be a fair amount of folks experiencing this over on mp-pistol.com but I wanted to run it by you guys as well.
Basically a round fails to eject and the empty case remains in the chamber. The slide cycles and tries to feed the next round. I’ve experienced this myself once in the 900 rounds my M&P9 has through it and it seems to happen with the 9mms only. Most have been with WWB but all.
Has anyone here, that owns an M&P, had this happen? Does it sound like extractor tension? Any other ideas?
The only time I’ve ever had that happen was when at the Fredericksburg match in Nov. 06 I had a Black Hills blue box 147gr MATCH round casing split in three spots, I have the casing somewhere around here. It took a squib rod to knock it out. 3.5K rounds through this one (my game M&P9) this one was a NRA Convention gun I got REALLY cheap used. It did have the earlier striker which broke while dry-firing. I’ve replaced it with the upgraded striker, and complete sear housing. It runs fine now. I did polish (no metal removal) the chamber and feed ramp to a like chrome finish.
I would say that it’s a failure to extract, it’s not given a chance to eject the spent casing. I would relate it to the chamber dimensions and/or the extractor tension.
If that extractor is a fitted part, whoever is assembling them is taking to much material off the pad.
If not fitted, they need to look at the dimensions and increase tension.
If it is a fitted part–it’s a huge frking blunder on their part.
I don’t believe the extractor is even pulling it back far enough for the ejector to do it’s thing. From what I gather it just leaves the case in the chamber.
I don’t recall Ernest Langdon telling me that the extractor is fitted. It is installed before the Melonite finish is applied to the slide. This maybe the problem. It may be making the extractor stick/bind a little.
It’s related to the two issues described. I doubt it’s any ammo used so far. I would contact S&W and ask some questions and return it for inspection/parts replacement.
You might have just got a bad few rounds that were not in spec. It’s not like we inspect & measure ever round. A few bad ones might have gotten into that case. Maybe those couple of rounds would have made any 9mm auto choke.
I have only about 400 rounds of the Winchester White box through mine. The rest has been American Eagle, Magtech and Black Hills blue box. Winchester White box Value pack from China-Mart isn’t synonymous with quality ammo. Usually it works okay but isn’t very accurate nor clean but it is butt cheap. The error-net can make a mountain over a mole hill and makes things seem way out of proportion, if it does it again with any ammo send it back to S&W.
USPguy was going to give them a call but he hasn’t posted a response yet. If it is WWB then it must be pretty widespread BUT I haven’t heard anything from the glocktalk folks and they would be screaming and crying “ammo” if it was happening with Glocks.
Where are you finding this on mp-pistol.com? I looked at every thread on page one (of two) in their Tech Difficulties forum and didn’t see this referenced once. I saw broken strikers, slide locking back, light primer strikes, loose front sights and rattling magazines.
Not flaming, just wondering where it is mentioned over there since I don’t visit as frequently as some sites.
