Check out WD3000 Sniper Rifle Low-poly 3D model on CGTrader for $12. High-quality mesh by janiscircenis: 3031 polys, 3434 vertices. PBR, Textured, UV Mapped.
FBX (Autodesk FBX, filesize: 321 KB), BLEND (Blender, filesize: 1.78 MB), TEXTURES (Textures, filesize: 610 MB), GLTF (glTF, filesize: 217 MB)