My first issue

[LASigmon]

I went to the range today and let one of my friends shoot my M&P 10 thinking he would be all " this thing is awesome ". Well, he did kinda. It would have been better if he didn't have three failure to feeds. It actually bent the cases When I got home and started reloading the mags I noticed one of them had a very soft spring. I pulled it out and stretched it out. Hopefully this is what caused the problem. If it is I can only blame myself for leaving the mags fully loaded for a few months.

 

[hoc9sw]

Probably not the cause. I would open a call about the mag, and see what they have to say. Mags should be good out of the box.

Grip (aka limp wristing) could contribute.

 

[LASigmon]

It could be limp wristing since it has never happened while I was shooting. It was his first time shooting an ar type rifle.

 

[MichiganScott]

Stretching a spring is a temporary fix at best. It needs to be replaced.

 

[Joey1911]

The mags that cam with my M&P 10 were junk. Constant failure to feed right out of the box... I was pissed. Got some DPMS mags and it's been running fine since.

 

[Muss Muggins]

It could be limp wristing since it has never happened while I was shooting. It was his first time shooting an ar type rifle.

Limp wristing with a rifle? Not saying it couldn't happen, but it seems a little unlikely, since the shoulder is what keeps the rifle from moving back, not the shooting hand.

 

[MasterTech1960]

Limp wristing with a rifle? Not saying it couldn't happen, but it seems a little unlikely, since the shoulder is what keeps the rifle from moving back, not the shooting hand.

May be it was Limp Shouldering Just saying. O.K I have no clue.

 

[LASigmon]

I forgot to mention it was a 20 round pmag.

 

[HYRYSC]

I forgot to mention it was a 20 round pmag.

Betcha mag is not the problem. I usually leave all of my mags for all of my guns loaded, never had a problem. The thing that causes spring fatigue is use, not compression. Now if you over-compressed the spring (21 rounds in a 20 round Pmag, then maybe.

Just do a quick google search and you can see what I am taking about.

 

[copemech]

Did they jam under the bolt? Is yours stock, and have you modded the gas port?

Where do your cases go, 3, 4 o-clock?

 

[LASigmon]

Yes, yes, no and 4 o'clock I think.