I put a Thompson 4X on my Remington 3.5 mag and it worked great. One thing no one has mentioned and this may just be me. The saddle mount worked great but when I shot the gun , one edge of the mount would dig in to my finger (not to comfortable). The Thompson has a 15" circle at 50 yards I think. It has a good deal of eye relief and was not a problem. I am going with a lighter gun this year but the Thompson scope will go on the new gun. Don