Ah yes, just some rifle models made by Roman Red.👌
So these are some rifle models made by Roman Red, AKA OFFcours1 on Sketchfab, and all of them were inspired by Dipo Muh's designs, which you can check them here[www.artstation.com].

Currently includes:
Rifles:
Dieselpunk Rifle
Steampunk Rifle
KGB - SOVA

Includes:
sketchfab\offcours1\dieselpunk_rifle\skf_offcours1_dieselpunk_rifle.mdl
sketchfab\offcours1\dieselpunk_rifle\skf_offcours1_dieselpunk_rifle_magazine.mdl
sketchfab\offcours1\dieselpunk_rifle\skf_offcours1_dieselpunk_rifle_muzzle.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova_belt.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova_magazine.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova_muzzle.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova_scope.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova_stock.mdl
sketchfab\offcours1\kgb_sova\skf_offcours1_kgb_sova_table_mat.mdl
sketchfab\offcours1\steampunk_rifle\skf_offcours1_steampunk_rifle.mdl
sketchfab\offcours1\steampunk_rifle\skf_offcours1_steampunk_rifle_attachment.mdl
sketchfab\offcours1\steampunk_rifle\skf_offcours1_steampunk_rifle_magazine.mdl
sketchfab\offcours1\steampunk_rifle\skf_offcours1_steampunk_rifle_muzzle.mdl
sketchfab\offcours1\steampunk_rifle\skf_offcours1_steampunk_rifle_stock.mdl

Credits :
Dipo Muh. - Original creator of the designs.
Roman Red (@OFFcours1) - Original creator of the models.
NeoLin - Porting to Source.
Fennecai[linktr.ee] - PBR to Source Converter.