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Thread: X300U wont fit ar-15

  1. #21
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    Yes.

    I have 2 X300 and neither would "fit" on my rails (4 different DD Omega rails) without serious force. I even tried lightly filing the grooves on the X300 with a triangle file to try and "loosen" it up. It didn't work.

    This really annoyed me as I want to be able to remove the light when I don't need it or switch between rifles/Glocks as needed. I was pretty aggravated.

    Then I switched to the locking bar, and they go on/off fine now and they are easier to attach/remove.

    Try switching to the locking bar instead of the pull down. I think the pull down drags on the tops of the rails.

  2. #22
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    Surefire recommended loosening the screw's 1/4 turn then installing. I had to do this for several X300U for both a Ar and multiple Glocks. Installs and removes easily now.

  3. #23
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    That was my experience with the U300 as well on my RISII. Worked better with the rail lock than the UP latch system for whatever reason.
    “Answer The Bell...” J.W.

  4. #24
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    Quote Originally Posted by RHINOWSO View Post
    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.
    Good idea on going off rear side.

  5. #25
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    Quote Originally Posted by CoryCop25 View Post
    I had to use a mallet to put mine on too....

    Comp is upside down I think.

  6. #26
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    Yeah, it was a pain in the ass to get my X300U onto any rail at all actually.
    Tried it on everything i had, just to check.
    Put on the lever locking bar thingy. Didn't do jack.
    Had to shave a bit of polymer from the guide rail of the the X300U (MUCH harder than one would think, by the way - modern polymers do not **** around)
    That helped a little bit. Still tough.
    Slightly loosened the screws holding the guide rails in place. Again, still tight, but manageable with some elbow grease. That puppy isn't going anywhere, that's for sure.

  7. #27
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    Just checked mine...fits both the Fortis Rev, and PRI gen III, snugly.
    It was and still is a much tighter fit to mount onto the rails on my HK45 and Sig 1911 and P220 SAO... It takes some force to remove it from the Sigs....

  8. #28
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    X300U wont fit ar-15

    Quote Originally Posted by jpmuscle View Post
    That was my experience with the U300 as well on my RISII. Worked better with the rail lock than the UP latch system for whatever reason.
    I run an X300U on the top rail of my NSR and found it very difficult to get on and even harder to get off. What I did was run it up and down the whole length of the rail a few times to sand it down a bit. Like jpmuscle, I found the it worked better with the lock pin.

    -john

  9. #29
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    Quote Originally Posted by Benito View Post
    Yeah, it was a pain in the ass to get my X300U onto any rail at all actually.
    Tried it on everything i had, just to check.
    Put on the lever locking bar thingy. Didn't do jack.
    Had to shave a bit of polymer from the guide rail of the the X300U (MUCH harder than one would think, by the way - modern polymers do not **** around)
    That helped a little bit. Still tough.
    Slightly loosened the screws holding the guide rails in place. Again, still tight, but manageable with some elbow grease. That puppy isn't going anywhere, that's for sure.
    Basically the same thing in my experience. Fits on my Glock rails the best, but it’s still stubborn. Won’t go on my 1911 to save my life. Put it on the rail and was pushing the back of the gun with the light against a table and couldn’t get it far enough on to make it to the first locking cut of the rail, let alone the third. I could see plastic shavings coming off when I was eventually able to get it back off the 1911 rail. Fits my Glocks easier now and my AR easy enough. I think it just needs worked in… might take a file and shave some more off so it fits the 1911.

  10. #30
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    Quote Originally Posted by Talon167 View Post
    Basically the same thing in my experience. Fits on my Glock rails the best, but it’s still stubborn. Won’t go on my 1911 to save my life. Put it on the rail and was pushing the back of the gun with the light against a table and couldn’t get it far enough on to make it to the first locking cut of the rail, let alone the third. I could see plastic shavings coming off when I was eventually able to get it back off the 1911 rail. Fits my Glocks easier now and my AR easy enough. I think it just needs worked in… might take a file and shave some more off so it fits the 1911.
    Yeah, I didn't mention it, but same thing here, as far as fitting on a Glock universal rail. A bit snug on a Glock, but way more manageable than on a Picatinny.

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