Check out Stylized Rifle Gun Low-poly 3D model on CGTrader for $24. High-quality mesh by noumansharif: 1500 polys, 1667 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 7.07 MB), FBX (Autodesk FBX, filesize: 301 KB), BLEND (Blender, filesize: 1.41 MB), DAE (Collada, filesize: 150 KB), SPP (Substance Painter, filesize: 6.78 MB)