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@UnknownDude As for giving new name to each attachment, firstly find the <LocName> for the sight in "weaponcomponents.meta" ( https://ibb.co/JmjT676 ), and go to dlc.rpf\x64\data\lang\ ( https://ibb.co/9nN70tp ) then export the "global.gxt2" of the language you are current using to Openformat ( https://ibb.co/y8XZwX1 )
here's a tutorial ( https://forums.gta5-mods.com/topic/12546/custom-gxt2-for-car-names-for-add-on-dlc/4 ) on how to edit this type of file, you can use this add-on mod as a base to edit ( https://ibb.co/ByKLVBz ), once you have done the naming part, import it back to replace the former one.
@UnknownDude Yes, new sights and grips can be customized (models, names), this involves editing "weaponarchetypes.meta( https://ibb.co/V9JYKbn )" & "weaponcomponents.meta( https://ibb.co/nmXg2rg https://ibb.co/Lg2VTqj )", once you have finished adding new attactments, go to the "weapons.meta" of the weapon on which you'd like to use them then add new lines ( https://ibb.co/wrt5XCV ). A weapon can have multiple sights and grips "ready to equip", however only one of each attachments can be installed at the same time( like this HK MP5 has 4 sights ready, meanwhile you can only have 1 sight work.
@UnknownDude you mean how to make new add-on weapons? here are a tutorial and tool that may help you: https://forums.gta5-mods.com/topic/222/tutorial-vehicles-weapons-how-to-do-add-on-s-replacer-s/2?page=1">https://forums.gta5-mods.com/topic/222/tutorial-vehicles-weapons-how-to-do-add-on-s-replacer-s/2?page=1
@UnknownDude Google Translate seems not to work properly on this, English maybe?