M&P jamming while chambering a round

**Trvlngnrs** · 08-06-11, 23:24

I've not had that problem with any of my M&P's.

Did she ride the slide forward with her hand?

Trvlngnrs

**chilic82** · 08-06-11, 23:51

I have a new M&P9FS. My wife was startled this evening while I was away,grabbed it, chambered a round,and found that it was jammed. It looks like the nose of the bullet is pressing against the feed ramp, and the slide doesn't have enough force to chamber it. Anyone else have these probs, or ever heard of it?

**iCarbine** · 08-07-11, 00:26

What ammunition?

Are you riding the slide forward, reducing its velocity and, thus, its power to chamber a round?

Can you replicate the malfunction?

What's the gun's history?

Why not just leave a round chambered all of the time, thus, eliminating the "need" to always unload the gun and waste that round of ammo?

Pictures?

**nickdrak** · 08-07-11, 00:38

Assuming she slammed the magazine in with the slide locked back, this happens with every M&P9 fs I have ever handled/shot when loading duty/hollwpoint ammo. I work for a pd where several of us carry them as our duty weapons. I have tried the "auto forward" technique with atleast 10 different M&P9's and they all get the top round jammed up against the bottom of the feedramp when using hollowpoint ammo. With fmj ball ammo this does not occur.

Even worse results with a brand new one I just picked up last week:
http://www.youtube.com/watch?v=C-w2i...e_gdata_player

**iCarbine** · 08-07-11, 00:47

This is why you perform administrative loading well before an emergency arises. You shouldn't need to dick with your gun when the alarm is going off.

**KhanRad** · 08-07-11, 00:50

The 9mm has a tendency to nose dive because the casing has tapered walls. So, when you stack it in a straight walled magazine, you end up with space near the front of the casing. The most reliable method of feeding the 9mm into a weapon is with a curved magazine like that of the MP5 so that that space is eliminated.

That being said, you can't curve a pistol magazine. So, in order to make feeding as reliable as possible, most manufacturers will extend the feed ramp down into the magazine well quite a bit to compensate for nose dive for the 9mm. You'll see longer feed ramps in Glocks, Sigs, and H&Ks.

I know that the M&P started off as a .40S&W, and that is the default production line. However, the .40(and .45 for the matter) does not need an extended feed ramp because it uses a straight walled cased which reduces nose diving. There is virtually no difference in the length of the .40 and 9mm feed ramps in the M&P......something that S&W needs to address.

**chilic82** · 08-07-11, 00:55

Originally Posted by nickdrak

Assuming she slammed the magazine in with the slide locked back, this happens with every M&P9 fs I have ever handled/shot when loading duty/hollwpoint ammo. I work for a pd where several of us carry them as our duty weapons. I have tried the "auto forward" technique with atleast 10 different M&P9's and they all get the top round jammed up against the bottom of the feedramp when using hollowpoint ammo. With fmj ball ammo this does not occur.

Even worse results with a brand new one I just picked up last week:
http://www.youtube.com/watch?v=C-w2i...e_gdata_player

This is what happens, but not while trying to auto forward. It happens when you have a mag in the gun and try to chamber a round. I don't know if she rode the slide or not, but I just tried it by doing it as I normally do, and the bullet moved about 3 mm and the slide stopped, with the bullet nose pressed against the feed ramp. I have noticed this before, as the chambering is always jerky/snappy/not smooth. I am using 124grn Gold Dot +p ammunition. The gun has about 200 rounds thru it. I don't leave it loaded, as I have young child, and don't have a safe yet (I've thought this thru plenty, and made my own decision to chamber when needed in my house.I live in a small slow town, that doesn't get much attention, while carrying it is loaded).