Check out M16 Rifle Game Ready and High Resolution Sculpt Low-poly 3D model on CGTrader for $5. High-quality Polygon mesh mesh by whitebeltstudio: 4000 polys, 16000 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 203 MB), TBSCENE (Marmoset Toolbag, filesize: 1.16 MB), TEXTURES (Textures, filesize: 203 MB), ZTL (Zbrush, filesize: 677 MB)