AK 50 BMG Low-poly 3D model is available on CGTrader for $10. Original author: CGmorph. Specs: 11365 polys, 35095 verts.
OBJ (OBJ, filesize: 64.7 MB), FBX (Autodesk FBX, filesize: 64.3 MB), TEXTURES (Textures, filesize: 102 MB), DAE (Collada, filesize: 37.7 MB), PNG (PNG, filesize: 63.9 MB)