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Thread: LMT 10.5 inch Problems after PWS FSC 556 Install?

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    LMT 10.5 inch Problems after PWS FSC 556 Install?

    Guys,

    I have an LMT MRP with both 14.5 inch and 10.5 inch barrels. I have run about 2000 to 2500 rounds through this rifle (mostly in the 14.5 inch) without any problems or malfunctions whatsoever. I recently changed the Smith Vortex flash hiders that I have on both barrels to the PWS FSC 556. I have run the FSC 556 on the 14.5 inch for a while and have had no problems with it. Today, I went to the range with the 10.5 inch barrel with the FSC 556 for the first time. From the very first shot fired, I had double feeds and also failures to eject. Again, I had no problems with the 10.5 inch when it had the Smith Vortex on it. I tried multiple magazines by multiple manufacturers (PMag's, Lancer's and Tango Downs) and they all had the same effect, even with different ammunition. My question is, would the FSC 556 be causing the problems? They only thing that I could think of would be that the FSC 556 is not allowing enough back pressure to cycle the gun properly? I haven't had much experience with SBR's and this is my first. Being that this is the only change that I have made, this is the only thing that I can thing of. I bet the 10.5 hasn't had 500 rounds through it, I have a dedicated bolt and carrier just for the 10.5 inch and I have been using the stock LMT buffer which is I believe an H. I swapped back to the Vortex on the 10.5 inch when I got home, I just haven't been back to the range yet. Do I need to run an H2 buffer if I plan on using the FSC 556 on the 10.5? Any help or info would be greatly appreciated.

    Thanks,

    Ben

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    Update

    I just went out to the range and ran 40 rounds through it with two PMag 20's using XM193 and the Smith Vortex. I had a failure to eject after the first round fired. I cleared it, ran the remaining 19 rounds rapid fire. Did a quick reload and fired the remaining 20 rounds rapid fire with no problems? Got me, anybody have any ideas? Also, I examined all of the empty casings and they all had a fairly heavy dent or crease on the side of the casing, about mid way down the cae body? I don't know if that would mean anything?

    Thanks!
    Last edited by INTrooper4255; 03-15-10 at 19:24.

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    What brand bolt carrier group?
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

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    LMT bolt and bolt carrier that I purchased with the barrel a few years ago.

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    Quote Originally Posted by INTrooper4255 View Post
    LMT bolt and bolt carrier that I purchased with the barrel a few years ago.

    I'd replace this with a Colt unit and see what happens.

    I also think you are in the "trinket" category with your flash hider decisions. I would not spend close to $175 on flash hiders when other parts of your gun are substandard.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

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    Quote Originally Posted by scottryan View Post
    I'd replace this with a Colt unit and see what happens.

    I also think you are in the "trinket" category with your flash hider decisions. I would not spend close to $175 on flash hiders when other parts of your gun are substandard.
    Maybe I missed something but the PWS comp in not 175$, and LMT is not substandard.
    "Intelligence is not the ability to regurgitate information. It is the ability to make sound decisions on a consistent basis "--me

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    Quote Originally Posted by scottryan View Post
    I'd replace this with a Colt unit and see what happens.

    I also think you are in the "trinket" category with your flash hider decisions. I would not spend close to $175 on flash hiders when other parts of your gun are substandard.
    WTF? this is horrible advice, scotty.

    OP- what buffer weight are you using? sounds like the weapon was probably borderline over-gassed to begin with, and the FSCs creating just enough back-pressure to push it over the edge..

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    Quote Originally Posted by Abraxas View Post
    Maybe I missed something but the PWS comp in not 175$, and LMT is not substandard.

    A PWS costs close to $100 plus shipping and the vortex is like $55 plus shipping.

    And an LMT is certainly substandard compared to Colt in the stock hardware and BCG with MIM gas key issues.
    Last edited by scottryan; 03-15-10 at 23:25.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

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    Quote Originally Posted by bkb0000 View Post
    WTF? this is horrible advice, scotty.

    OP- what buffer weight are you using? sounds like the weapon was probably borderline over-gassed to begin with, and the FSCs creating just enough back-pressure to push it over the edge..

    How is it horrible advice?

    When some off brand AR15 comes across my path that doesn't work and I gut it and replace parts with Colt and it works, how is that bad?
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

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    Quote Originally Posted by scottryan View Post
    How is it horrible advice?

    When some off brand AR15 comes across my path that doesn't work and I gut it and replace parts with Colt and it works, how is that bad?
    because you can gut a Colt thats not working right and fill it with LMT parts and it's just as likely to work right.

    you're a purist, and i respect that.. but claiming LMT is "sub-standard" is bullshit. the INDUSTRY standard is far below what LMT is doing.

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