Free ak - 47 lowpoly and highpoly Free low-poly 3D model by cg-productions. Available on CGTrader with 14000 polys and 15000 vertices. Check it out on CGHub.
MAX (Autodesk 3ds Max, filesize: 8.52 MB), OBJ (OBJ, filesize: 1.15 MB), FBX (Autodesk FBX, filesize: 6.12 MB), 3DS (3D Studio, filesize: 26.8 MB)