More Problems

[Aldoradave]

I have settled on 308 for ammo stockpile so have dumped a bunch of 30-06. I have 1 M14 and 1 M1A with a bunch of military surplus 7.62 x 51 that my father left me. It is all dated 1979 but works just fine in my old M14 and new M1A.

But it doesn't work with a damn in either of my new M&P 10s, neither the 20 round Magpul or the stock 10 round steel.

Is it the mags or is the M&P 10 just too sensitive to ammo type?

Dave Dillehay

 

[rootbrain]

I have settled on 308 for ammo stockpile so have dumped a bunch of 30-06. I have 1 M14 and 1 M1A with a bunch of military surplus 7.62 x 51 that my father left me. It is all dated 1979 but works just fine in my old M14 and new M1A.

But it doesn't work with a damn in either of my new M&P 10s, neither the 20 round Magpul or the stock 10 round steel.

Is it the mags or is the M&P 10 just too sensitive to ammo type?

Dave Dillehay

Well, when you say it "doesn't work" exactly how? If you explain in more detail you might get better response. The fact that it "doesn't work" is pretty broad.

Also "surplus ammo" is pretty broad. Who made it?

 

[rojodiablo]

Well, when you say it "doesn't work" exactly how? If you explain in more detail you might get better response. The fact that it "doesn't work" is pretty broad.

Also "surplus ammo" is pretty broad. Who made it?

I have to agree; more info please.

Remember, the true 308 ammo runs hotter than the military 7.62. (Opposite the 223/556) A rifle whose gas system is set to run 308 might have issue with underpowered or old, old ammo. But circa 1979 is not that old for factory ammo, and should be no problem.

 

[amazingflapjack]

As stated-.308 and 7.62X51 is not the same thing.

 

[Aldoradave]

I had two problems. One was a failure to extract a cartridge after firing, the other problem was several times the round jammed up trying to insert the cartridge, one time even bending the projectile.

Dave Dillehay

 

[rootbrain]

I had two problems. One was a failure to extract a cartridge after firing, the other problem was several times the round jammed up trying to insert the cartridge, one time even bending the projectile.

Dave Dillehay

That sounds like short cycling. The ammo doesn't have enough "ummph" to completely cycle to BCG for extracting and loading another round. You might try a box or two of new .308 to see if you have the same problem.

Just because the surplus your father gave you works in two other rifles doesn't mean it's GTG for this one.

Also, it could indicate an issue with the mag. Make sure to "tap" the mag to insure the rounds are all the way back, check the feed lips, spring tension etc. I see you have more than one mag the problem occurs on. Something I always use with my mags is a product called Tetra Gun. It's a flouropolymer light lubricant/cleaner. I always take new mags apart and use this on them, inside and out. Since I started doing that I've had far, far fewer FTE and feed problems with any of my guns. And ejecting empty and loading full mags is easier as well.

Wouldn't hurt to check the feed ramps either, make sure there are no burrs or machine marks. Perhaps a polishing is in order.

 

[jcsdad]

I had two problems. One was a failure to extract a cartridge after firing, the other problem was several times the round jammed up trying to insert the cartridge, one time even bending the projectile.

Dave Dillehay

hi, I have the same problem in my new rifle. called s&w and was told I have to send it back and they will fix it. am now waiting for the call tag. what have you done to fix this problem?

 

[cb4017]

Is your 79 dated surplus ammo USGI? My M&P 10 functions fine with Lake City 60s vintage M80 ball and M118 Match ammo. It also runs TW and WCC fine.

All the problems I've read about so far have been with foreign ammo.

 

[maico75]

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.

 

[Arkaden]

Just seconding all this. My factory SW mag is a piece of garbage. It does appear to have follower problems. Had a few problems with it, like others I swapped to Pmags and no issues. I have since shot the old magazine to make me feel better.

 

[jcsdad]

anyone know where i can get a CA compliant pmag for my M&P 10? would like to try it once before i ship this rifle back to S&W. been to the range 2x,(same problem FTE, FTL) thought cleaning and oiling the gun would work. it did not and hoping for an easier fix before i ship it back.

 

[maico75]

10 rd pmag

jcsdad- I contacted Magpul yesterday to check the status of their new 10 rd mags and they are sheduled for mid 2013 but not out yet. They just said to keep checking the website. I did seem to have a little better results with the PMC .308 ammo as opposed to the Lake City 2013 stuff so some of the issues may be do to underpowered? 7.62 NATO. I too am stuck with Ca laws, the Pmag I used was when I was visiting my buddy in Nev last weekend. I want to get my hands on some 10 rd Pmags too. You might want to just send the mag back, not the whole gun. It seems like the gun shows here are a good way to get other than stock mags. A friend of mine bought a 20 rd Pmag rivited to 10 rds at a recent show.

 

[maico75]

DPMS 10 rd

jcsdad- you may also want to try a DPMS 10 rd mag before you send your gun back. They are in stock at Midway. I just ordered one so I have something to shoot with until I get my stock mag back from S&W (hopefully functioning well).

 

[jcsdad]

maico75.... i was having the same problem using the factory mag and the DPMS that I ordered from Natchez. I think they are the same magazine (made buy ASC). I could be wrong, but it sure looks the same to me. The only thing different is the factory mag has the m&P logo on the bottom. thanks and good luck

 

[maico75]

jcsdad- I tried a DPMS 20 rd mag last weekend also and it worked fine. So I hope that the 10 rd works for me. I have heard that they made the S&W mags- Hopefully just a bad batch. The follower in the 20 rd DPMS mag was different than the S&W 10 rd but the bottom plate looked the same. The S&W seems to cock and stick easily. The DPMS worked smoothly and would not stick.

 

[jcsdad]

maico75.... hope it works for you too....i may be able to try a magpul. a local gunstore was kind enough to let me use one this weekend. i was also advised to try ammo "with more ump" so i got a box of american eagle. (not easy to find ammo where i am).

 

[jcsdad]

just got back, put around 60 rounds of different makes of american made ammo. used 3 different mags. for the first time, I was able to shoot my rifle.....long and short, this rifle does not like the CBC and Norinco ammo and the mags did not matter. will let my shoulder heal a bit then go back for more

 

[MassDave]

glad its working for you now.

 

[mandsmyer]

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

 

[jcsdad]

that ammo (CBC m80) sucks, when used on an M&P10, has anyone tried using it on an M1A? just trying to figure out what i can do with (450+)what i have left. thanks