E.aurther brown has a tasco optima base,  and i just bought the pride / fowler special ops sight which is something like a doctor sight only a lot better, the dot is round and is not to bright [ dot flair] as in the optima and the all generations of the doctor sight.     p/f also makes a base for the freedom arms,  i used there weaver base and put it on my ssk base.   you can get the sight & base  at midway.  bob