It's a pain to replace those rubber O-rings in a 760. I've done it. Without it they turn into rattle traps.
Then you read too many internet stories and don’t shoot enough. I guarantee you I have shot them more than most and have never had to change one. You scent will scare more critters than a 760/7600 ever will. If a buck heats my gun “rattle” it’s too late for him to do anything about it at that point.
Xs 2
I have ONLY known 1 760 that rattled.
I personally have 4 and have had 2 or 3 more — none rattled.
I have friends that own & hunt them.....none rattled.
Yes, I know ‘some’ rattle BUT I don’t know How they were treated or mistreated.
Secondly, why do you need a metal DUST cover ? Don’t.
Thirdly, LOTS of machinery & engines use O ring gaskets. Why don’t you replace them?
Fourthly, the muzzle blast not only covers any noise but you can be reloaded before the shot sound is gone.
Jerry