Not knowing the vintage of your 760 , I can't answer your question . What I can tell you is that you don't want to attach your sling to the forearm of any Rem. pump . The reason is that a forearm mount wears on the action . I ahve several 760s and 7600s and the foreward swivel mount is a barrel band on every one of them . Put it about two inches ahead of the forearm and you're good to go !
What the hell has that got to do with his original question?
If it is a 760 Remington, the forend attach screw must be missing; I've never seen on that didn't have one.
And besides, Uncle Mikes makes a dandy sling swiven that replaces that swrew and it is a dandy, don't need a barrel band type either.