I've been thinking about a custom-made peep-sight for my 464, and a mod to the safety. I'll make the peep-sight myself, but I have another weaver-type mount sight I want to try first.
I want the grip safety better: smooth and perfect with a smoother spring action so you don't push/not push the lever by mistake. I'm not taking this hunting, so no problem IMO, but theoretically you could bump the lever and bump-fire the gun right now. Except that the safety is so balky! It might fire & it might not depending on whether the lever wiggled when bumped. LOL
Anyhow, my safety is I unload the gun. I hasn't moved more than 3 feet loaded, since purchase, as I've only shot it at the range.