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Thread: Stag/S&W M&P-15

  1. #101
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    Quote Originally Posted by C4IGrant View Post
    Did you clean and properly lube the weapon? At about 200-300rds, the oil will burn off and it will need re-lubed.



    C4
    After picking up my m&p i cleaned and lubed it with CLP. On the 1st range visit i ran about 250-300 rounds through it. Didn't clean it until i got home that evening. Re-lubed prior to shooting last weekend. With the factory mag I had 5 out of 25 rounds fail to feed. The problem I'm having is the the bolt begins to feed the round, but doesn't quite seat all the way to full battery. When you cycle the action to remove the failed round and feed a new one, the round is bent with scrape marks on one side, and no indent on the primer. I also have two HK mags, and only had a couple problems with feeding on these mags.

    ps. on the second range trip i did clean and re-lube around 100 rounds.

  2. #102
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    Quote Originally Posted by powderkeg45 View Post
    Just got my M&P 15A a couple weeks ago. Only has about 400 rounds through it. Anyone else having problems with FTFs? Tried a half dozen magazines, but still had a few ftfs. BTW, I'm new to the AR platform, and any help would be greatly appreciated.
    I repaired a M4C members upper a month or more ago. (it was a S&W M&P15) that was giving his some weird jams and short stroking, not going completely into battery etc.

    I replaced the carrier key and screws, staked properly. Removing the barrel from the upper receiver, reinstalled and torqued properly. Reamed chamber to 5.56mm NATO and it now runs fine. His barrel had been installed with approx. 10-15ft lbs of torque and I could turn the barrel within the upper by hand with the receiver mounted in the vise block.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  3. #103
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    Quote Originally Posted by powderkeg45 View Post
    After picking up my m&p i cleaned and lubed it with CLP. On the 1st range visit i ran about 250-300 rounds through it. Didn't clean it until i got home that evening. Re-lubed prior to shooting last weekend. With the factory mag I had 5 out of 25 rounds fail to feed. The problem I'm having is the the bolt begins to feed the round, but doesn't quite seat all the way to full battery. When you cycle the action to remove the failed round and feed a new one, the round is bent with scrape marks on one side, and no indent on the primer. I also have two HK mags, and only had a couple problems with feeding on these mags.

    ps. on the second range trip i did clean and re-lube around 100 rounds.

    There could be several issues at work here. Your buffer spring could be too weak to push a round into the chamber. Load one round into a mag and drop the bolt. Fire the round. Does the bolt lock back?

    If it does, then take a mag loaded with 30rds and drop the bolt. Did it chamber a round? If no, then either your buffer spring is weak or your mag is holding the rounds too tightly.

    As M4 stated, you could have a chamber issue as well, but we will wait to check that last.

    What ammo are you using?


    C4

  4. #104
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    Thanks for the tips, I'll try loading a mag with 30 rounds and see what happens. The first magazine i tried after cleaning the weapon had 20 rounds in it, and it failed to load the first round by pulling back and letting fly the charging handle. I did try 8-10 mags with only one round in each, and each time the bolt locked back after firing.

    First I was using UMC 47 grn hollow points. Then I was shooting federal american eagle 55 grn fmj.

  5. #105
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    I had a similar problem with my M&PT, the upper was out of spec and they replaced it.

  6. #106
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    Quote Originally Posted by Shihan View Post
    I had a similar problem with my M&PT, the upper was out of spec and they replaced it.
    Shihan, how did you go about contacting s&w about that?

  7. #107
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    The phone number is on their website, have them send you a call tag and tell them you want it returned Air and not ground as you need the weapon back ASAP. If you have the CMT bolt thats not staked right tell them you want it staked and they will probably switch it out for a LMT like they did for me.

  8. #108
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    Quote Originally Posted by powderkeg45 View Post
    Thanks for the tips, I'll try loading a mag with 30 rounds and see what happens. The first magazine i tried after cleaning the weapon had 20 rounds in it, and it failed to load the first round by pulling back and letting fly the charging handle. I did try 8-10 mags with only one round in each, and each time the bolt locked back after firing.

    First I was using UMC 47 grn hollow points. Then I was shooting federal american eagle 55 grn fmj.

    When you are loading a round, Lock the bolt back and then use the bolt release. Using the charging handle to chamber a round can be a bad idea.

    The ammo you have is ok, but 47gr hollow points are geared more for bolt gun than an auto loader IMHO. When troubleshooting a problem, try to always use mil-spec ball. This takes some of the guess work out of it.



    C4

  9. #109
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    Quote Originally Posted by gotm4 View Post
    Here's a pic of a CMT carrier from an older S&W M&P15.



    And here's one from a new S&W M&P15T. Clearly a LMT carrier.

    My carrier matches the photo of the CMT carrier. The key is tight however and hasn't seemed to loosen up at all. Don't know if this could be causing my problems or not. I do know that when I try to manually extract the rounds from my factory mag, the right side column is much more difficult to remove from the mag than the left side rounds. The factory 30 round mag is also 1/2 to 3/4 of an inch shorter than the HK 30 round mags.

    Just got an email back from someone and S&W saying that I should call them and ask for a return label. Pretty impressive on how fast he got back to me via email.
    Last edited by powderkeg45; 06-16-07 at 02:01. Reason: adding to post rather than creating a new one

  10. #110
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    I've read thru the entire thread and it would seem that Colt has the fewest complaints of all guns. I realize this is a Stag/S&W thread but Colt is a referenced manufacturer.

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