I have a scope mount on my 870 that bolts onto thereceiver by replacing the 2 pins in the trigger assembly. It is easy to change out the barrels, but I hate having to re sight for slugs in the fall and turkey loads in the spring. I just bought a second scope mount and a NWTF 2x32 Simmons shotgun scope that I plan on sighting n with my turkey loads this spring.My plan is to have one scope sighted for turkeyloadswith my vented rib barrel and one sighted in for slugs. I think there will be less work when I put the other scope back on this fall as I'm currently shooting 50 yard clover leaf patterns with my smoothbore barrel. I'm sure I'll have to re-zero every season, buthopefully not by that much.