To install with OpenIV you replace the provided w_sr_sniperrifle_luxe and w_sr_sniperrifle_luxe_mag files in these two places: 

GtaV\mods\update\x64\dlcpacks\mpluxe\dlc.rpf\x64\models\cdimages\weapons.rpf
GtaV\mods\update\x64\dlcpacks\patchday8ng\dlc.rpf\x64\models\cdimages\weapons.rpf

And you must replace the provided w_at_scope_max_luxe files in these two places as well:

GtaV\mods\update\x64\dlcpacks\mpluxe\dlc.rpf\x64\models\cdimages\weapons.rpf
GtaV\mods\update\x64\dlcpacks\patchday8ng\dlc.rpf\x64\models\cdimages\weapons.rpf

Don't forget the gun model has its own scope but will still spawn with a luxe scope on it. 
Install the optional scope (which is invisible) in Ammunation or with a trainer to make the gun look correct.

Thanks for downloading.