.45 Revolver :
https://sketchfab.com/3d-models/smith-wesson-revolver-66f185b995bb4bb59fe05668835edb2b

M1911 : 
https://sketchfab.com/3d-models/m1911-pistol-80a0b8a6c4314da4a7b3a7cfe6cec1d4

USP45 : 
Escape from tarkov

STI E6 : 
https://sketchfab.com/3d-models/m1911-pistol-80a0b8a6c4314da4a7b3a7cfe6cec1d4

M1 Thompson  : 
https://sketchfab.com/3d-models/m1a1-free-5eec4c487895439d8e762f719ae9c3da

M1928 Thompson Drum : 
https://sketchfab.com/3d-models/tommy-gun-3f3eecc0307f499e8d1fc16d56d74c83

and many others for additional parts