Korth national standard 357 Magnum Low-poly 3D model is available on CGTrader for $5. Original author: ValeriiHorlo3Dmodels. Specs: 6736 polys, 6439 verts.
MA (Autodesk Maya, filesize: 1.1 MB), OBJ (OBJ, filesize: 2.4 MB), FBX (Autodesk FBX, filesize: 744 KB)