Check out SAG AK MK3 Chassis Low-poly 3D model on CGTrader for $8. High-quality mesh by Akinaro: 16783 polys, 8341 vertices. PBR, Textured, UV Mapped.
BLEND (Blender, filesize: 207 MB), BLEND (Blender, filesize: 207 MB), OBJ (OBJ, filesize: 210 MB), FBX (Autodesk FBX, filesize: 208 MB), DAE (Collada, filesize: 209 MB)