Ah yes, the SPAS-12 shotgun from Half-Life 2, now available on workshop.👌
This one is actually an interesting story, as it never really got released and was still fairly unpolished on some parts.

But still, thatrtxdude still gave me the files of it and allow me to upload it to here.👌

This addon is labeled as "Legacy".
Which means that it's an older version of the mod that's supposed to work with other older addons, or required for other addon that uses the older version of this addon.

Credits :
thatrtxdude - Original creator of the addon.
NeoLin - Reuploading the addon.