BigDodge,
The S&K InstaMount is probably a good design given the limitations for no drilling and tapping required by milsurp buffs. I just bought the MoJo peep sight system for my Swede M38 and find the price( $44.95) and design to be excellent. I prefer peep sights to just about anything else, maybe even a scope at times. Peep sights are fast on target, work w/o optics or batteries (red-dots), and are accepted by the most demanding bench-rest competitors.
savageT