SHOTGUN STF 12 Low-poly 3D model is available on CGTrader for $4.99. Original author: Karevus. Specs: 4628 polys, 5363 verts.
OBJ (OBJ, filesize: 175 KB), SPP (Substance Painter, filesize: 208 MB), TBSCENE (Marmoset Toolbag, filesize: 1.17 MB), TEXTURES (Textures, filesize: 19.6 MB), MAX (Autodesk 3ds Max, filesize: 296 KB), FBX (Autodesk FBX, filesize: 323 KB)