Installing a Holosun 507c on a Sig X-5 Legion

*Note: 6-40 screws come with the filler plate.

I ran in to a few obstacles when installing my Holosun 507c (that has the ACSS Vulcan reticle). The Holosun doesn't come with the right screws, and you need to use 6-40 size screws to mount it to your slide. Also, a filler plate from C&H Precision Weapons is highly recommended due to it making four points of contact, rather than two.

Filler Plate:
https://chpws.com/product/sig-p320-w-r1p-dpp-cut-w-rmr-holosun-holes-filler-plate-for-rmr-sro-holosun

Holo:
https://www.primaryarms.com/holosun-hs507c-v2-acss-pistol-red-dot-sight-acss-reticle