Check out Colt M4 Rifle Low-poly 3D model on CGTrader for $10. High-quality Polygon mesh mesh by uncleartyom: 14200 polys, 15800 vertices. PBR, Textured, UV Mapped.
BLEND (Blender, filesize: 2.96 MB), OBJ (OBJ, filesize: 2.04 MB), FBX (Autodesk FBX, filesize: 887 KB), GLTF (glTF, filesize: 38.6 MB), SPP (Substance Painter, filesize: 113 MB), ABC (Alembic, filesize: 1.83 MB), DAE (Collada, filesize: 3.29 MB)