Eotech 512 Scope Low-poly 3D model is available on CGTrader for $10. Original author: n3600. Specs: 7954 polys, 60422 verts.
MAX (Autodesk 3ds Max, filesize: 264 MB), OBJ (OBJ, filesize: 264 MB), FBX (Autodesk FBX, filesize: 264 MB), SPP (Substance Painter, filesize: 264 MB), 3DS (3D Studio, filesize: 264 MB), TBSCENE (Marmoset Toolbag, filesize: 264 MB)