C79A2 is what you see on a C7A2. They have a upgraded base on the with a counter spring to help return to zero. 1.5 lbs tho, not light but real robus. Theyre mounted on C9 LMG that people slam down the feed tray cover with the optics mounted on them. Also normally grab by the sight.
You can find a older C79 sight for under 500$