Saddle will be a lot less permanent, but will put your optic up a little higher. If you are used to a low cheek weld looking down the rib the saddle will probably put you on more of a jaw weld. I like the pic rail so you can get the sight much lower on the bore axis, which will also give you a closer point of aim/point of impact at different ranges. A super high optic will put your hits lower than your point of aim at point blank ranges, you may not notice with a wider pattern, but a super tight pattern could be an inch or two low inside 10 yards. Hopefully you’ll have a shot before then, but something to consider.I may try a saddle mount first and see how it performs!
Does your barrel have a rib? I've been using a reflex sight on a rib mount for years. No drilling/tapping or saddle. It's light weight and has no issue with POI/POA shift since the sight is on the barrel. I can't imagine using anything else. Meadow Creek Mounts has some rib mounts that fit the 870 rib and most popular sights.
What brand is it and where did you get it. I want one like this.
What brand is it and where did you get it. I want one like this.
All of mine use a Burris 336 mount. I had the holes drilled and tapped for it.View attachment 1010969