I like to use the Burris rimfire aluminum scope rings. Light weight and well made.
Perfect for any semi auto marlin

 

I have found with my automatic 22's that a ring clamped to a 3/8" dove tail will vibrate loose and/or just move . I recommend in integral ring mount with some loc-tite. I bought a UTG model RGPM2PA-25M4 for my 70PSS and I also have one on my Model 795. This is sold by UTG Leapers for about $15 is has about 3" of clamping surface. BKL also makes some very nice units.

 

With any configuration you go with be sure to use a little bit of blue (medium) strength loctite on the clamping screws as jambuster mentioned. That should keep you trouble free.

 

scope mount

The Leaper's mount works with the Marlin receiver dovetail which is usually not a precisely machined feature. I have one on a mod. 60 with a 30mm scope. I did not Loctite anything and have not had to re-adjust zero although I've had it for four years and about 3500 rounds.

 

I have the same set-up on my 60 as sevenL4 and after 4 years it has been rock solid.

Mals

 

Once I tried one of these on my Marlin semi's I stopped using all others https://www.bkltech.com/SearchResults.asp?Search=260D7 :bthumb:

 

The UTG and BKL hardware look very solid! Those mounts that are 3 inches or 4 inches in length look like good options. I noticed that there is a lacquer on the dovetail grooves on the receiver of the 70PSS. I guess the lacquer is to improve the gripping of the scope mounts once they're tightened.

 

I decided to give the UTG a try and ordered it.