I've got a saddle mount made by Leupold that I've put on my 870. I have a 20" smooth bore barrel. Scope is a 1-4x Leupold shotgun scope. It keeps its zero just fine. Not hard to install or remove, but you do have to rezero when you put it back on. Also, the saddle mount blocks the sights, so you can't just remove the scope rings (I have QD rings) and leave the mount on.
M1911
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