Sight Bridge Scope Mount Question

Discussion in 'Excalibur Crossbows' started by SkOrPn, May 12, 2013.

  1. SkOrPn

    SkOrPn Member

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    Hello,

    Because of my choice in Scope, the Nikon Bolt XR is only 8" in length. It has very little movement forward or back on the mounts. The only real adjusting comes in the way of the Picatinny Rail, and that also has very little adjustment room. My Mounts are the ones Danny Miller provided me, I believe they are medium profile.

    I am wondering if anyone has ever had the need to try Scope Extension mounts, or something similar to the Nikon P-series below? I really would like to go a inch or two further back, but I am not paying no freggin $50 like these Nikon rings go for, lol...
    [​IMG]
    Any ideas on how to move the Scope further back without spending much?
     
  2. SkOrPn

    SkOrPn Member

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  3. Deerstalker

    Deerstalker Active Member

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    I talked with Danny before his heart operation about the scope rail and adding additional notches to enable me to move the scope back as the rail I have only has 5 notches. Danny said that it would be easy to take a file and make a notch or 2 in the existing rail as it is made from aluminum and would be easy to file. The Nikon Bolt Xr scope has a 3" to 4" eye relief and for me the scope mounted as shown in the picture is clear, and very accurate. I may in the future file another notch in the front section to enable this scope to be moved back one notch position. The notch does NOT have to look like a factory job as it will be covered up by the scope mount rings.


    [​IMG]
     
  4. SkOrPn

    SkOrPn Member

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    You actually have one more notch you can go back on, and I do not. The rail was machined away on the last inch or so just above the safety switch. I need that extra rail space in order to go further back, as you can clearly see below.

    [​IMG]

    If at all possible I would like the front of the Scope to be flush with the front of the Picatinny rail.
     
  5. Deerstalker

    Deerstalker Active Member

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    If you look closely at the rails you will see that yours & mine are identical rails with 5 notches. You are using notch 1 & 3 counting from the rear and I am using 2 & 4. I need a notch between 3 & 4 so that I can move my scope back a notch. This is another way to solve our problem and it will fit on all Excal crossbows.

    http://www.excaliburcrossbow.com/catalog/crossbow/the_guardian_anti-dry_fire_scope_mount
     
  6. SkOrPn

    SkOrPn Member

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    Yeah, that would be the sweet spot.

    [​IMG]
     
  7. Boo

    Boo Senior Member

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    Take a look at the old scope bases.
    [​IMG]
     
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  8. Tinker

    Tinker New Member

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    Who makes this mount, and where is it sold?
    Thanks
     
  9. SkOrPn

    SkOrPn Member

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    Its a no name mount I am sure. Found it while looking through ebay for mounts that are offset. Looking at the other images of it it looks quite nice for my application (my scope will be covered with a camo fabric, so the machining and paint flaws will be hidden), it even has the scope tube pads to protect the scope from scratches.

    http://www.ebay.com/itm/360651000053
     
  10. SkOrPn

    SkOrPn Member

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    Is the base shorter on the older ones, or is the rail longer? It still has 5 groves only.
     
  11. Boo

    Boo Senior Member

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    The rear of your scope base is scalloped out. This older one is not. There's no problem with cutting out more slots. Just use a square to mark your slot. Use a hacksaw and file to create a additional slot as needed.
     
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  12. SkOrPn

    SkOrPn Member

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    My problem is I do not have enough rail to cut another slot. I need more rail so my eye piece is equal to how yours is on your Matrix. I think my only viable and affordable option is to get that offset rings above and paint it myself. I just realized I have some really nice Rust-Oleum Professional Flat Black Enamel left over from a custom Water-Cooled Computer I built for a client recently that will work perfectly on the rings, assuming I can properly sand it down. I think the rail on the Excals were designed for the Scopes they sell with them and not so much for after market scopes, like my short Nikon.
     
  13. nepabowhunter

    nepabowhunter Member

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    The Hawke rings look like they will do what you need at a cheaper price than the Nikons.
     
  14. Boo

    Boo Senior Member

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    Do you need more than an inch?
    [​IMG]
     
  15. SkOrPn

    SkOrPn Member

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    No, an inch or two would probably be just right but without actual adjustment ability I am not sure. Just 5/16" inch back and the forward bell would be flush with the end of the rail.

    Ok I just comfortably set my cheek up against the butt of the stock like I was ready to shoot and I am definitely several inches out of my eye relief specs. I have to move my head forward at least two inches to get full view. This sucks lol now that I see how bad it is. Is my neck too short for this xbow? It's almost like I need the stock shorter.

    Mysteriously sent from my Nexus 7
     
  16. SkOrPn

    SkOrPn Member

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    Are those excalibur bridges in that photo?

    EDIT: I wonder if Excalibur would trade me a bridge for a hardly used bridge? Lol

    I just measured the rear and the machined out metal on the back of my bridge is what I need returned... It would give me 1.5" more rear adjustment and probably make all the difference.

    Mysteriously sent from my Nexus 7
     
  17. Boo

    Boo Senior Member

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    It's an older scope base that you can likely buy from a dealer that takes trade-ins.
    You could also drill new holes in your scope base and move it back. You can grind the rear end of the sides so that you can still reach your safety.
     
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  18. SkOrPn

    SkOrPn Member

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    This looks like it might work, if the image is true. http://www.amazon.com/Excalibur-2006-120-Scope-Mount/dp/B000PW7OVQ


    OR, even this

    [​IMG]
     
  19. xbowhardcases

    xbowhardcases New Member

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    I just purchased a bolt XR to try out on my matrix 355. The clarity of the scope compared to the Hawke I have owned is a significant improvement.

    so based on the posts above has anyone tried out these offset 1" mounts? http://goo.gl/023Ou
     
  20. Deerstalker

    Deerstalker Active Member

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    I don't believe that you will have a problem with the 355 as the mounting rail is different than the one we are having a problem with. I believe that your mounting rail is extended back almost to the safety position, look at the rail and the screw mounting holes. Our mounting rail has a cut out on the rear that the 355/380 do not have. I was able to move my Nikon Bolt back and it is just fine for my shooting with reference to the eye relief. See picture and the front of the scope does not touch the rail as it has a semi V notch down the length of the rails. Hope this helps and it was simple to cut another notch in the rails as Danny and Boo said.

    [​IMG]
     

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