Mounted to a 20 year old Marlin 60 using the provided 3/8" dovetail mount with no issues although this set up looks like it could over tighten with a little too much force.  Very easily sighted the scope to 50 yards and the gun was putting CCI high velocities in a tight group.  Great scope for plinking or paper as visibility is clear and bright in the daylight.  Everything was in focus, nice and crisp, no adjustment necessary.  The crosshairs are easy to see and thin down near the intersection.  I found the adjustable eyepiece helpful to set the distance from my eye in the shooters position.  Comes with a clear and yellow protective cap system and you can shoot with out removing these which is a nice way of keeping the glass glean. Windage and elevation require a small screwdriver, but this is common.  Setting these parameters was easy and the settings worked smoothly and yet felt solid.  I found the 9x magnification to be sufficient at 75yards but lacking at 100yrds.