$5 Sidewinder 2 BUIS sights Low-poly 3D model by Akinaro. Available on CGTrader with 7000 polys and 3500 vertices. Check it out on CGHub.
BLEND (Blender, filesize: 75.2 MB), BLEND (Blender, filesize: 75.2 MB), OBJ (OBJ, filesize: 75.1 MB), FBX (Autodesk FBX, filesize: 74.8 MB), DAE (Collada, filesize: 75.4 MB)