Check out M4 Skeletonized F1 Firearms Low-poly 3D model on CGTrader for $40. High-quality mesh by lauer95: 130000 polys, 70000 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 1.89 GB), FBX (Autodesk FBX, filesize: 1.89 GB), PNG (PNG, filesize: 1.89 GB), TEXTURES (Textures, filesize: 1.89 GB), OTHER (Other, filesize: 139 MB)