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Thread: Upper Not Fitting Onto Lower

  1. #11
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    It was the buffer tube. I back it out by one turn and presto everything is a go.





    Now when I have the ammo and time (I am not digging into my stash) I will go fire. Well I need to save and get a BUIS for the rear first.

  2. #12
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    Quote Originally Posted by JimmyB62 View Post
    Also check to see that the receiver extention (buffer tube) isn't threaded in too far. They can bee threaded in one turn too many which will allow it to protrude just slighly into the lower receiver thus preventing the upper from closing completely.
    i agree, BUT..., when i run across this problem, i find that backing off the tube one full turn will allow the buffer retainer to pop out, so what i do to fix this is to chuck it up in my lathe and remove a half thread, try it, then remove more metal and try when it fits i then take a small rat tail file and in the bottom of the tube where the retainer touches it, i file a small half circle in the groove.

    all buffer tubes are NOT created equal

  3. #13
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    Parts I used:

    Spike's Tactical stripped lower
    Stag LPK
    MagPul MIAD
    MagPul CTR
    LMT Buffer Tube
    LMT Castle Nut
    Brownells End Plate
    Wolf Spring
    H Buffer
    LaRue DMR-16 upper receiver (I thought about building my own upper, but being this is my first time, I decided to focus on just doing the lower.)

  4. #14
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    Kaiser,

    You might want to stake those endplates/castle nuts. At least one of them looks as if it isn't.



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  5. #15
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    Quote Originally Posted by Iraqgunz View Post
    Kaiser,

    You might want to stake those endplates/castle nuts. At least one of them looks as if it isn't.
    It is not as of yet. I know I will have some fine tuning to attend to since this is my first . . . anything else missed?

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