Aloha 45R:
I don't know if this will help but I have many ARMS #18 mounts in the old and new version. With a scope mounted, you cannot use your iron sights. In order to use the iron sights, you must remove the scope (base should stay on the rifle) and you should then be "good to go".
I have no experience with a Smith Ent. scope mount, so you might have to wait until on the others come to help out.
I have mounted an Aimpoint to my ARMS #18 with no problem. But I felt the rifle was capable for much further distance than my Aimpoint allowed so I removed it. I hope this helps some.
Aloha,
Tom O.
I don't know if this will help but I have many ARMS #18 mounts in the old and new version. With a scope mounted, you cannot use your iron sights. In order to use the iron sights, you must remove the scope (base should stay on the rifle) and you should then be "good to go".
I have no experience with a Smith Ent. scope mount, so you might have to wait until on the others come to help out.
I have mounted an Aimpoint to my ARMS #18 with no problem. But I felt the rifle was capable for much further distance than my Aimpoint allowed so I removed it. I hope this helps some.
Aloha,
Tom O.