This mod adds data of installed custom attachments as sights/stocks/etc to installed custom weapons and fixes incompatibles between some custom attachments. Additionally mod provide support for adding new DLCs attachments.

Custom weapons and attachments supported by this mod must be kept up to date otherwise custom attachments could be missing from custom weapons or not work correctly. 

Extract archive content to "mod_overrides".
How to Install Super BLT and mod_overrides mods tutorial by Master Indigo

For adding support for own custom weapons refer to "Custom attachments for custom weapons/hooks/template.lua" file.