Check out MP5 mega pack Low-poly 3D model on CGTrader for $26. High-quality mesh by Sonya-MaLchik: 28426 polys, 17743 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 7.73 MB), GLTF (glTF, filesize: 3.35 MB), FBX (Autodesk FBX, filesize: 1.45 MB)