$50 SKS M5966 Low-poly 3D model by mohammad-allahrezaei. Available on CGTrader with 4201 polys and 1334 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 910 MB), FBX (Autodesk FBX, filesize: 910 MB), DAE (Collada, filesize: 910 MB), 3DS (3D Studio, filesize: 910 MB), MAX (Autodesk 3ds Max, filesize: 1.22 GB), SPP (Substance Painter, filesize: 2.06 GB)