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Thread: Sig P320 X-Five Legion with Holosun 507K Optic Mount

  1. #1
    Super GunNutz 9mmGunGuy's Avatar
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    Sig P320 X-Five Legion with Holosun 507K Optic Mount

    I'm mounting a Holosun 507K Optic on a Sig P320 X-Five Legion and it looks like I'm missing an optic sealing plate (see below).
    Anyone know where I can get this? They are in stock at Sig but they don't ship to Canada.
    Note: The optic mounts directly to the slide even without this plate but the original adjustable rear sight screw holes are exposed.

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    Super GunNutz bacardi's Avatar
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    I believe it uses the exact one that RMR uses. Anyone that sells RMR parts probably sells them too. Mine uses RMR plate
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  3. #3
    Super GunNutz 9mmGunGuy's Avatar
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    Found one at IRG on their US site.
    CSSA/CCFR MemberAn unjust law, is no law at all.Martin Luther (1483-1546)
    There may be times when we are powerless to prevent injustice, but there must never be a time when we fail to protest. Elie Wiesel

  4. #4
    CGN Ultra frequent flyer gdawg's Avatar
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    I don't believe you need that for the Holosun because the battery loads from the side. You just need the right adaptor plate.

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    You still need a filler plate to mount the holosun/rmr. Or you'll be wearing the red dot in your face after a few rounds when your screws shear off from the force.

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    CGN Regular luciferco's Avatar
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    i think you just need the spacer adapter plate. C&H makes one for 507K 407K is the same size I believe.
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    try black box customs and ######Armoury

  9. #9
    CGN Regular cptseawolf's Avatar
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    Quote Originally Posted by Spuhalsky View Post
    You still need a filler plate to mount the holosun/rmr. Or you'll be wearing the red dot in your face after a few rounds when your screws shear off from the force.
    The sealing plate only ensures the RMR remains waterproof...
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  10. #10
    GunNutz Rippo's Avatar
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    Hmm not aware of a sealing plate ? As stated ^^possibly for waterproofing ?
    I went with The Outer Impact mounting plate using a Romeo 3max picked up from DoubleTap sports.
    There are a few different footprints it will accommodate. So most likely Holosun would fit? Lost instruction sheet oops.
    Also part of Plate mounts into the forward pocket in the slide so it’s quite secure.

    Now looking at the Holosun upcoming Red Dot is the SCS .
    It will be No battery. Using solar and a capacitor to operate.
    Also they will be gun specific to model. So=no mounting plate will be used just direct mount.
    Not holding my breath but looking forward.
    Interested to learn more please update once completed!
    Attachment 637300

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