More Problems

[Lil65GTO]

Just picked up my new M&P 10 saturday. Same problem with not feeding with the stock magazine. The first round will chamber and fire but the next round will not move up all the way to the lips in the rear of the mag and the bolt will not strip it off to chamber. Usually it will just push it back in to the magazine but sometimes will try to chamber it and bend the cartidge. Tried a Magpul PMAG and it worked fine. It seems to be a follower problem. Tried Frog lube and it did not improve. S&W told me to send the mag back and they will fix it.

maico75, I'm having same problem. Just shot my 10 today... ACS mag piece of sh*t! 1st round loads, but then the remaining rounds all seem to move forward in the mag (out of position) and bam*** no worky.. initial feeding ok, seems to run 1st 3-4 rounds then bam*** no worky... Thought maybe I didn't load mag properly so unload, reload start and bam*** no worky - SH*T...

After multiple attempts, I noticed the follower was not flush. I think this is a mag issue, not an ammo issue. No problem with eject.

 

[chkv]

I've brought my M&P10 out to the range twice now and had similar issues each time. There were no problems ejecting rounds, always feeding issues. The first time, whenever the ACS mag would get down to the last 3-4 rounds, the bolt would be unable to strip the cartridge due to the angle of the mag follower. The bolt would just scrape over the top of the brass casing. It didn't jam at all otherwise.

However, on my 2nd trip, rounds were instead getting jammed every so often when loading and the bullet was getting bent in the casing. I had to throw out about 5 of the 50 or so rounds that day.

I made sure to completely clean and oil the rifle first and after every trip to the range. Others have mentioned this rifle needs anywhere from 100-200 rounds before it breaks in. I sure hope that's not the case since that's quite an expensive process. I've only put about 80 rounds through it so far and it's been a bit disappointing.

 

[rojodiablo]

It,s the ammo. I just purchased an m&p 10 took it out last weekend and tried to fire 7.62 146gr CBC ammo and it did not like that at all, basically became a bolt action rifle, bolt would not go back enough to load next round. Enough to eject but not fee. I just went out today with 308 rounds and it did perfect, no malfunctions. I have found that the 10 rd mag that comes with the rifle is basically useless. Not sure if I got a bad one but lots of issues with it even with the 308 rd. the 308 rds I used were 180gr federal s and hornadys. Little more kick but very shootable. Maybe after a few hundred rounds it will loosen up and the buffer spring will soften up and you can shoot the 7.62 ammo. I will try after a few hundred rds myself. By the way I used 20rd Pmags. Hope this helps

I will say that my rifle is the same platform, but not the M&P. It was in need of breaking in to get it to run 100% of the time. In the beginning, it was a bit ammo sensitive, but not like these rifles. I ran about 250 of this stuff thru the rifle while on my trip to Texas this spring. No issues whatsoever; the rifles SHOULD operate on almost any ammo shoved down their pipe.

 

[MassDave]

I use the ACS 10 round magazines and have had no problems i could blame on them. i have had plenty of problems with some of the ammo, but the same magazine with different ammo works flawlessly.

 

[Waddy]

Add another user having the exact same feeding problems with the factory magazine. I talked to the factory rep and he was aware of the problem. Told me to oil the bearing surfaces on the follower and inside the mag case. Didn't help. Frankly, I'm pretty surprised that S & W would supply a magazine with this type quality. I live in a pretty remote area of Colorado (which now has joined the dark side unfortunately), so buying a good 20 round PMag locally is out of the question for the present. I had my gun store order a couple of 10 round PMags, but it is pretty aggravating when the factory equipment fails so miserably to function.

 

[rojodiablo]

Add another user having the exact same feeding problems with the factory magazine. I talked to the factory rep and he was aware of the problem. Told me to oil the bearing surfaces on the follower and inside the mag case. Didn't help. Frankly, I'm pretty surprised that S & W would supply a magazine with this type quality. I live in a pretty remote area of Colorado (which now has joined the dark side unfortunately), so buying a good 20 round PMag locally is out of the question for the present. I had my gun store order a couple of 10 round PMags, but it is pretty aggravating when the factory equipment fails so miserably to function.

Never oil a magazine. It attracts gunk like a dog **** draws flies.
Clean it out; you can use brake cleaner in the metal mag body, but DO NOT hit the plastic follower with any solvents like acetone, alcohol or brake cleaners. Use simple green, dish soap, laundry soap, etc.
If the follower is so gritty that you feel a need to use anything in there, a dry Teflon spray would be the only possible choice.
It's not magazines, it is the buffer weight, and friction on the bolt in the upper receiver. I swear it.

 

[Waddy]

Never oil a magazine. It attracts gunk like a dog **** draws flies.
Clean it out; you can use brake cleaner in the metal mag body, but DO NOT hit the plastic follower with any solvents like acetone, alcohol or brake cleaners. Use simple green, dish soap, laundry soap, etc.
If the follower is so gritty that you feel a need to use anything in there, a dry Teflon spray would be the only possible choice.
It's not magazines, it is the buffer weight, and friction on the bolt in the upper receiver. I swear it.

Never oil magazines is my normal position with magazines as well, but the S&W rep I talked to on the phone told me to do just that. I thought it was worth a try and might help with a "break-in period". I do think it might have helped a little, though not much. I can, and will, clean it properly later.


It is definitely a magazine problem, as the problem can also be replicated with the magazine outside the gun, just pushing the rounds out manually. The rounds slide forward and the follower does not push the rear of the cartridges up far enough for the bolt to engage the head; it just slides over the rear of the cartridge and scrapes up the side of the case until it either jams or closes on an empty chamber.

Thanks for a very useful discussion everyone!

 

[KentB]

My M&P 10 came with a Magpul 20 mag.
No problems at all.
Hopefully Magpul will start pumping out their 308 mags soon.

 

[LlindeX]

Add another user having the exact same feeding problems with the factory magazine. I talked to the factory rep and he was aware of the problem. Told me to oil the bearing surfaces on the follower and inside the mag case. Didn't help. Frankly, I'm pretty surprised that S & W would supply a magazine with this type quality. I live in a pretty remote area of Colorado (which now has joined the dark side unfortunately), so buying a good 20 round PMag locally is out of the question for the present. I had my gun store order a couple of 10 round PMags, but it is pretty aggravating when the factory equipment fails so miserably to function.

Waddy,
Don't know exactly what part of CO you're living in, but down hear on the "Front Range" we still have lots of dealers selling repair kits for your existing 20 round magazines. (Cop friends and lawyers tell me It's entirely legal.) If your in NW Colo. and ever get down here, you can easily pick one up. If you ever go up to Rock Springs, WY; just buy yourself a new 20 round magazine, take it apart, put it in a zip-lock bag, mark it as "Repair Parts" with a Sharpie marker, and bring that sucker back home with you. (We can't let CHickenlooper, win on this one.)

Oh, and by the way, S&W, YOU Folks should be ashamed of yourselves for putting crappy magazines without anti-tilt followers in a gun you mark with a $1619 MSRP. That takes real smarts if you ask me! I might expect a similar issue if I were buying an el cheapo import gun. But it chaps my XXX to pay this kind of money and get a magazine that I have to overhaul or replace before I can shoot my gun. It's happening far to often, and you guys know about the defect. Correct the problem!