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Thread: Modern Sporter - Build Discussions

  1. #1521
    CGN Regular sphen's Avatar
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    My barrel fit loosly as well, I tried a couple different ones and it was the same for all of them. Didn't really think much of it as they tightened up just fine with the barrel nut.
    WTB: Surefire 300 Ultra

  2. #1522
    Super GunNutz Patt08's Avatar
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    If it was a barrel problem then how did this same barrel fit my SLR? I also tried this barrel in a spare upper I had kicking around and it fit snug. I tried my ballistic advantage barrel in my MS upper and it was also loose.


    Quote Originally Posted by greg olmstead View Post
    Sounds like a barrel problem not an upper problem. Both of my uppers fit the barrels very tight and I had to use the barrel nut to seat the barrel completely
    |CCFR|

  3. #1523
    CGN Regular greg olmstead's Avatar
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    It still fits the Ms upper. Every dimension on the uppers are checked after they get them back from ano and if it's not within spec they don't ship it out. Tolerance stacking is a problem. If you have a barrel extension on the small side and an upper on the bigger side of the tolerance its going to be loose. If you are worried about it send it back to atrs and get them to double check it with your barrel.

  4. #1524
    Super GunNutz Patt08's Avatar
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    Quote Originally Posted by greg olmstead View Post
    It still fits the Ms upper. Every dimension on the uppers are checked after they get them back from ano and if it's not within spec they don't ship it out. Tolerance stacking is a problem. If you have a barrel extension on the small side and an upper on the bigger side of the tolerance its going to be loose. If you are worried about it send it back to atrs and get them to double check it with your barrel.
    My question was should I be worried about it. Everything is put together and shoots good so idk. I just don't have experience with this particular issue is all. I emailed them anyways, so ill see what they say when they get back to me.
    |CCFR|

  5. #1525
    Business Member Rep. ATRS Shaun's Avatar
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    Quote Originally Posted by Patt08 View Post
    My question was should I be worried about it. Everything is put together and shoots good so idk. I just don't have experience with this particular issue is all. I emailed them anyways, so ill see what they say when they get back to me.
    There is no safety concern in regards to what you are describing. If a tighter fit is desired I have heard from some folks that they bed their barrel extension into all upper receivers using loctite 620. This is not a method that I have experience using myself, and am merely passing along a customers recommendation. Use at your own risk. [Although I am told there is no risk]

  6. #1526
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    Quote Originally Posted by Patt08 View Post
    My question was should I be worried about it. Everything is put together and shoots good so idk. I just don't have experience with this particular issue is all. I emailed them anyways, so ill see what they say when they get back to me.
    One option I’ve seen is people use Indian head (brand name) basket shellac compound. Check out “fifty%” on YouTube. He swears by the stuff. I’d sooner use than that a locktite, at least this you can remove easily.
    ΜΟΛΩΝ ΛΑΒΕ

  7. #1527
    GunNutz ColinD's Avatar
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    The green loctite 620 isn't a thread locker, it's a retaining compound designed for cylindrical applications, seems perfect. We use this stuff at work all the time, it will fill a gap of 0.015.

    I never thought of using it, but I will definitely "borrow" a few drops from work if needed for my barrel/upper.

  8. #1528
    CGN Regular AMET's Avatar
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    Quote Originally Posted by ATRS Shaun View Post
    There is no safety concern in regards to what you are describing. If a tighter fit is desired I have heard from some folks that they bed their barrel extension into all upper receivers using loctite 620. This is not a method that I have experience using myself, and am merely passing along a customers recommendation. Use at your own risk. [Although I am told there is no risk]
    Just remember, 620 is permanent. You would need to heat it up to over 500deg F to get the loctite to break it's bond before you hammer it out. Lots of people do it, but I would rather not since I change my mind on barrels pretty often.
    ��
    "This year will go down in history. For the first time, a civilized nation has full gun registration! Our streets will be safer, our police more efficient, and the world will follow our lead into the future."
    Adolf Hitler, 1935

  9. #1529
    CGN Regular RobbieLaidlaw's Avatar
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    Not seeing many builds, lets see more photos guys.


    -Robbie L

  10. #1530
    Member khw's Avatar
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    Quote Originally Posted by RobbieLaidlaw View Post
    Not seeing many builds, lets see more photos guys.



    "Mk12 mod 1" Modern SPRter

    ATRS MS receiver
    Custom ATRS SPR barrel 18.6"
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    DD mk12 gas block
    Knights Armament mk12 mod 1 free float RAS
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    PRI M84 gas buster charging handle
    LMT FA BCG
    Larue Tactical LT104 QD SPR mount
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    ARMS #32 Bipod Mount
    Harris Engineering BRM-S w/ KWM Pod-Loc
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    VLTOR A5 buffer system
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    KAC end plate sling mount
    ERGO grip
    Geissele SSA-E trigger
    Geissele LPK


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