ArturR is right, only the MS (of full production planes) has a radar scope. And MiG-21bis avionics/radar .
The walkaround pictures in the link above are of a MiG-23S Flogger-A , which is an early variant which wasnt full production, it has 21bis avionics too due to a delay in Sapfir-23 radar production/get-it-ready-for-service thingo.
All full production M/MF/ML/MLA/MLD/P ( all variants with Sapfir-23 and derivatives ) have NO scope. All data is displayed on the HUD, including IRST output.
The "HUD" is not like a western-style HUD, its not a primary flight instrument. The Flogger HUD ("SEI" which means something like Data Display/Indicator) is for weapon/radar/attack info displays, and has few indicators for own plane status.