SWEP Construction Kit
DEVELOPER tool (for EXPERIENCED SWEP scripters) to create more diverse SWEP designs for gamemodes and such without needing completely new models. This tool can be used to create weapon designs for viewmodels and worldmodels, as well as to finetune ironsights.
It’s listed under Weapons / Other.
I made a user guide for the tool right here:
http://steamcommunity.com/sharedfiles/filedetails/?id=153130501
If you want to tweak the official tool you can fork my Github project:
https://github.com/Clavus/SWEP_Construction_Kit
If you find any bugs, well, support ended years ago. Have fun!