M&P-15 needs break-in period?

Discussion in 'Rifle Country' started by Bart Noir, Nov 26, 2007.

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  1. Bart Noir

    Bart Noir Member

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    Bought on on Saturday, fired it up on Sunday. And it was a jammamatic, seldom successfully loading a second round. Tried with 3 different magazines, and suspected the bolt wasn't coming all the way back. In fact, after the last round in a mag it wasn't and we could tell that.

    We kept lubing it and firing it, mostly as a single shot AR15. After 150 rounds, all was well and it fires just fine.

    So is this normal for a new AR? Did anybody else need a break-in period on a AR15 design?

    Bart Noir
     
  2. EdLaver

    EdLaver Member

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    No thats not normal from my experiences. I have a DPMS m4 style and it ran smoothly right out of the box with me only having to oil it. All is well if its functioning fine now for you. Congrats on your 1st AR!
     
  3. Cacique500

    Cacique500 Member

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    My M&P 15 has been running smoothly now for about 3000 rounds, never a hickup since coming out of the box.
     
  4. skinewmexico

    skinewmexico Member

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    Not normal. But S&W thanks you for helping to de-bug their new product, rather than going with an established manufacturer.....of ARs.
     
  5. Bart Noir

    Bart Noir Member

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    OK 'mex, I missed the part where you describe your experiences with the S&W M&P 15. Did you have some troubles that soured you on this brand?

    Bart Noir
     
  6. SpeedAKL

    SpeedAKL Member

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    The guns seem to have a pretty good reputation so far...
     
  7. Mr.Revolverguy

    Mr.Revolverguy Member

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    Are these your reloads that you are shooting? I noticed with mine that factory loads were not a problem. But the loads in the books I use that are start/beginning loads were not stout enough. As soon as I went to middle of the road on my reloads it functioned properly without a problem.
     
  8. yongxingfreesty

    yongxingfreesty Member

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    i hate guns with said break in periods. if i buy a new gun that doesnt function properly I sell it right away.

    luckily, that hasnt happened to me yet.
     
  9. hags

    hags Member

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    Break in periods are for shoes not guns.
    I'd take it to the place you bought it and tell them about it.
    I do believe the M & Ps are assembled from CMT/Stag parts.
    Is this your first AR?
     
  10. F=ma

    F=ma Member

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    Picked up a 15PC last weekend. 10 rounds fired for function, which went without a hitch. Waiting for scope to come in before more extensive workout.
     
  11. strat81

    strat81 Member

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    They're not new anymore and S&W doesn't make them anyway. (IIRC, most of the parts are CMT.)
     
  12. Fast Frank

    Fast Frank Member

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    My M&P15 ran from the start.

    I've fired around two thousand rounds so far with NO jams, goofs or unhappiness.

    Mine likes them and shoots them fine, but I have seen ARs that don't like the Remington soft point .223 ammo. I think they are right at the maximum length.

    What bullets were you shooting when it jammed?
     
  13. swingset

    swingset Member

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    If it's short stroking, make sure you're using good ammo, and double check that the carrier key is tightened down, and that it's staked down properly...that can be a problem.

    If that's not it, by all means send it back. Smith has GREAT CS and will take care of it.

    With good ammo, an AR should function 100% out of the box. There's no break-in needed, ever.
     
  14. Babalouie

    Babalouie Member

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    Sounds like the gas tube was obstructed...must have finally blown it clear. My DPMS needed the wolf buffer spring to cycle reliably.
     
  15. swingset

    swingset Member

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    Doesn't sound like the OP's problem is resolved, at least by the posts so far.

    It could be a gas port issue, but that's best left to Smith on a new gun. If it's not ammo, a carrier key or gas ring issue, the tube or port could be the culprit. I'd check the obvious stuff, ammo first, bolt & carrier, and if that fails send it back.
     
  16. skinewmexico

    skinewmexico Member

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    Nope, you caught me, I have no experience with the S&W. I apologize. I just find it odd that S&W got into the AR business 30 years late, and that anyone would want to not take advantage of that 30 years experience with other companies.
     
  17. DnPRK

    DnPRK Member

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    I suspect the parkerized finish on the bolt carrier rails and back of the bolt lugs was rough. The drag created by rough parkerization was probably enough to prevent the B/BC from cycling until it was burnished down by repeated firing.
     
  18. Bartholomew Roberts

    Bartholomew Roberts Member

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    Well, the problem you described is short-stroking. It happens when there is not enough gas pressure to overcome the friction in cycling the bolt carrier group. That means either too much friction in the bolt carrier group or gas leaking from the gas system.

    No telling what it might have been - could have been a rough bolt carrier that smoothed out, partial obstruction of the gas tube that finally cleared, or a tiny leak from the gas key that sealed up from carbon. Usually, it is just not enough lubrication/too much friction. It isn't unheard of in any rifle; but most ARs do fine without a break-in.
     
  19. Bart Noir

    Bart Noir Member

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    Thanks for all the comments. I was using only 1 load of ammo, that being South Africa mil surplus, made using Radway Green brass. A complete test would have included others, and other bullet weights. I think these were 55 grain.

    The last 40 or 50 rounds were failure free, from a couple of different magazines, so I really thought there might have been a bit of a break-in situation going on here. And maybe we had too little lube on the bolt carrier. I am going to be picking up the Army field manual on the M16 to see what it says for lube amounts, type and location.

    Yeah, this is my first AR. It has been decades since Uncle Sam let me shoot up one of his. Think triangular handguard :p

    Bart Noir
     
  20. MassMark

    MassMark Member

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    Sat at thew range a few weeks back shooting my M1A and listening to the muffled mumbles of an LEO cursing out his M&P15. He'd get off a few rounds then - jam city. I stopped shooting and sat and watched him for a while. Something didn't seem right. Though muffled by my hearing protection, the M&P15 went something like this: Bang, bang, BANG, bang, bang, jam, Bang bang, BANG, BANG, bang, Bang, jam....The capitalization was intentional. It was his ammo. When he took a break, I walked over and talked to him for a bit. It was his first day with his new rifle and he was pissed - cursing Smith and Wesson and swearing his rifle was a dud. It was then I noticed this giant box of Ultimax ammo on the bench next to him. "Be right back" I said as I retreated to my .50cal can and fished him out 80-rounds of Winchester 55gr Q3131, walked back over and said: "Here, give this a try". He politely refused at first, but after I insisted he loaded up 20 into his 30rd mag and ripped them downrange with no issues whatsoever. He loaded up another 20 and I loaded up another 20 and no troubles. With a big grin on his face, he went to offer me some dough, but I've been a "pay it forward" kind of guy long before the movie or Oprah made it popular, (thanks Mom)....

    I guess some things aren't always as they seem now are they? ;)

    EDIT: Bart - I just noticed your last post. I was literally talking with an ammo manufacturer in Massachusetts on Saturday about the very ammo which you describe. The conversation came about after I was talking about burning through 3,000 rounds of South African .308 in the last year. He stated that he liked South African .308, but found some batches of South African 5.56 to be problematic, (inconsistent loads I remember him telling me)....Try some different fodder....
     
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