For my bolt guns, a sling and good optic. I have two lever guns and both have slings and one has a scope. Of my .22’s all have slings and about half have scopes. Of my three AR’s two have just slings and my latest has a sling(Magpul MS3 Gen 2) light(Surerfire G2 with a Malkoff M61 drop in) and optic(Eotech 512). I also borrowed a friends Aimpoint Pro to compare to the Eotech, so I can form some good opinions on which works best for me. More on that later.
Robert