The weight is actually the same. I liked the mk5 being smaller but the clarity was better at distance past 700yds for me with the mk4.Interesting. I'm on the hunt for a 3.6-18 MK5 for my LMT 6.5CM gas gun. What do you prefer more about the MK4? I did want a lighter optic, but from my understanding the MK4 is supposed to be more budget than the MK5HD?
The mk5 was on a bolt action btw so going to the slightly bigger scope was fine for me. May be different for a gas gun setup