Check out Old Cannon Low-poly 3D model on CGTrader for $12. High-quality mesh by Infinity-Models: 18242 polys, 17894 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 5.57 MB), SPP (Substance Painter, filesize: 1.18 GB), FBX (Autodesk FBX, filesize: 3.43 MB), MA (Autodesk Maya, filesize: 1.92 GB), MEL (Maya Mel Script, filesize: 1.92 GB), TEXTURES (Textures, filesize: 871 MB), GLTF (glTF, filesize: 741 MB)