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Thread: X300U wont fit ar-15

  1. #11
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    I run a 300U on a KAC RAS and it's TIGHT.

    I guess it's normal. I can smack it on with my hand but I have to pry it off.

  2. #12
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    Quote Originally Posted by sinlessorrow View Post
    Thanks so much, this worked. I also sanded down the rails some and it slides on and off but it takes some serious pressure to get it to.
    I had to loosen and use some mechanical agitation to get my x300u on my SR15 with URX 2 rail.
    ETC (SW/AW), USN (1998-2008)
    CVN-65, USS Enterprise

  3. #13
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    Quote Originally Posted by CoryCop25 View Post
    I had to put it on and then tighten the screws down.... I just remembered.
    Ditto. I have three X300U. Two on M&P9, one on a DD Mk18 upper.

    Loosen screws, tap with plastic mallet into place, tighten screws.
    Last edited by Ready.Fire.Aim; 05-10-13 at 08:27.
    "Jill, if there's ever a problem, just walk out on the balcony ... take that double-barrel shotgun and fire two blasts outside the house,.." VP Joe Biden Feb 19, 2013

  4. #14
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    My X300U mounts easily to my LMT MRP Piston's rail.
    AMERICAN INFIDEL

  5. #15
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    Could be that the picatinny rail is out of spec. I've seen some from 'quality' mfgs that were oversized and some accessories wouldn't fit properly. Or maybe the X300U needs some adjusting. My X300U slides onto my MRP easily...haven't even tried it on any others.

  6. #16
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    Quote Originally Posted by CoryCop25 View Post
    I had to use a mallet to put mine on too....

    How are you digging that BCM comp?
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  7. #17
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    I assume you have the right key insert and rails on the light?

  8. #18
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    Quote Originally Posted by BufordTJustice View Post
    How are you digging that BCM comp?
    It has exceeded my expectations. Some more pics and video on the custom build forum...
    "Perfect Practice Makes Perfect"
    "There are 550 million firearms on this planet. That's one firearm for every 12 people. The question is... How do we arm the other 11?" Lord of War.
    "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." Thomas Jefferson

  9. #19
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    I run x300's on all my rifles. Each one was a bear to get on. Pounded the shit out of them to the point of wondering if I would break them. Anyone had the pleasure of removing one that was diff. to put on?

  10. #20
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    X300U wont fit ar-15

    Quote Originally Posted by 6933 View Post
    Anyone had the pleasure of removing one that was diff. to put on?
    Yes, the one I have has been installed on multiple rifles (Noveskes, SCARs, DD rails) and sucks going on, even worse going off. On the SCAR I tapped it back off the rear of the side rail it was such a PITA.

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