winchester m12 3D model is available on CGTrader for $20. Original author: petrohands-designs. Specs: 36686 polys, 37583 verts.
BLEND (Blender, filesize: 5.16 MB), OBJ (OBJ, filesize: 1.34 MB), FBX (Autodesk FBX, filesize: 2.37 MB), DAE (Collada, filesize: 2.66 MB)