The scope is a 2-3/4x and not 4x as advertised. The 4x has a long eye piece for the added magnification. The optics on the ones here are very nice. However, I understand the whole mirror mounting bit is somewhat fragile and best limited to lighter recoil. They are relatively light and compact although, as you can see, stick up in the air a bit. At the very least, they will garner a few strange looks at the range!
The scopes all have a dovetail on the bottom and the mount is specific to the rifle. The 'coin slot' screw on the side loosens it all up. Early ads stated one could remove the scope and not lose zero. They even built a peep that could be slid in the mount for open sight applications.
I have mounts for a Marlin 36/336 and a Remington 81/181 and have been searching for years for one for a Marlin 39.
