The Midwest Industries AK 47/74 Generation 2 Picatinny Rail Quick Detach Modular AK Scope Mount should not have any issues with adjustment screws loosening. It will fit a Riley AK47.
There is no lateral adjustment even though it looks that way. The screw holes are round and allow for no movement. I needed to center the rail over barrel to I dremeled the holes oblong to allow for lateral movement. With threadlocker and now over 200 rounds through the rifle there has been no movement.