So I ordered Skinner peep sight - rear and front to match, for my Marlin 44. Then, as I was thinking about it, I remembered that I was asking about front sight height for BL-22. Then it occured to me, those random moments when you just remember something out of the blue and go mother-f**er! I went back to the email and realised that I ordered rear Marlin sight and front .22 sight. F@#k! Then I thought, well, I could send one back, wait for a very long time, get the new ones, etc. No! So I ordered receiver 22 sight and front 44 sight.
Sort of funny $140 mistake. But now I am in two minds about putting peep sights on the 22.