Check out 77 3D Model cartridge and Mortar WW12 Base Mesh -VOL 03 Low-poly 3D model on CGTrader for $13. High-quality mesh by mohadesefrz: 534251 polys, 541229 vertices. UV Mapped.
OBJ (OBJ, filesize: 2.16 MB), MAX (Autodesk 3ds Max, filesize: 7.21 MB), OTHER (Other, filesize: 19.7 MB), FBX (Autodesk FBX, filesize: 10.4 MB)