Instruction #1: Tighten screws down until you get the desired resistance without over-tigthening the screws.
Instruction #2: Get a different front sight so you don't take a chunk of flesh out of your non-drawing hand when you draw it.
Seriously, both my buddy and I were playing with it to get the right amount of retention and the "V" notched front sight cut us both. The cutaway for optics leaves your non-drawing hand where the front sight will snag you and take a nice chunk of skin off.
Now that I filed down that "V" on the front sight, the holster is frickin' fantastic! I can definitely say that my Mark II has drawn blood now!
Thank you BDM for bringing another great product to the rimfire market! This is by far the best holster out there that I have found for a Ruger Mark pistol - especially if you have a suppressor!