Looking for a replacement front sight like the ones on the other R models. my r7 has the dovetail slot. I am looking for something like what's on a 300 mini. Thanks.
I assume you mean the old-style transverse dovetail?
There are lots of old firearms sights made for that kind of mount, including target-style tunnel sights with replaceable inserts, etc. I don’t know specifics of dovetail sizes, etc., but I’m sure you could find one that worked or could be modified to fit.
As an example, here’s a Lyman sight on an old Remington 521T target rimfire, that similarly replaced the simple OEM post front sight.