Vortex Optics Sparc II Red Dot Sigh Low-poly 3D model is available on CGTrader for $10. Original author: ivanka4op. Specs: 14048 polys, 7369 verts.
OBJ (OBJ, filesize: 13.2 MB), MA (Autodesk Maya, filesize: 13.2 MB), FBX (Autodesk FBX, filesize: 18.4 MB)