The release trigger is one where you pull the trigger, and the gun fires when you release it. It was made for folks who flinch. That raises the question of who modified the gun, I don't think it was Winchester, but you never know. I have a thing about modified guns, I like em stock, then I have somewhere to begin if something is wrong with it. With a modified gun, you have professional gunsmiths and you have other gunsmiths...which one did it?
I would pass it up, unless you flinch. BigG