This 3D model was originally created with Sketchup 6 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 This is the inside of a handgun. Not all of the insides, but the basic trigger-hammer-pin inside. I know, several measurements may not be precisely correct but it gives you an idea what happens if you pull the trigger.
STL (Stereolithography, filesize: 58.4 KB), OBJ (OBJ, filesize: 52.2 KB), 3DS (3D Studio, filesize: 42.4 KB), DAE (Collada, filesize: 96.8 KB), FBX (Autodesk FBX, filesize: 93.6 KB), IGE (IGES, filesize: 299 Bytes), MAX (Autodesk 3ds Max, filesize: 100 KB), SKP (Sketchup, filesize: 121 KB), OTHER (Other, filesize: 40 KB)