ZF 4x24 either Hensoldt or Karl Kaps on all my Swiss Arms, SG542 and SG540s.
A reticle much like the picket post of a C79 Elcan, good glass and very comfy eye relief.
Surprisingly light weight which is pretty important on a Swiss Arms.
I am just too old and too bad of eye to play with Elcans and ACOGs anymore.