Closest thing is probably the nail gun from Lonesome Road.
When I read the words, "nail gun", I'm thinking, this thing makes noise.
Does it?
Explosives work well to cripple deathclaw legs to slow them down.
Or you could get the And Stay Back perk for shotguns that gives you a very high chance to knock them over before they get to you.
Well....I know explosives make noise, for sure.
Part of the allure of the Dart Gun was that is was SO quiet. It was basically 1/2 stealth and 1/2 paralysis. And I guess I didn't make it clear in my OP that this gun could also be used on people if you needed a quiet way to kill someone in a crowd. That's all I got to say. hehe
Thanks for all this cool feedback though.