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holosun 509

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  1. PDP
    I have a Holosun 509T on my PDP 4.5" with a C&H adapter plate and considering BUIS for co-witnessing. Which tritium/luminous type iron sights will work well, for this setup? I would like to keep the BUIS as low as possible, but obviously still usable when needed. Only the front sight needs to...
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