Stranger's Rifle for any gun. I do have a Khostov from my third character that I'm keeping in my vault for basically sentimental reasons. Legendary+ would be my Epitaph 2261. The first Vanguard weapon I ever bought. I never plan on deleting it because I just went through so much with it. I also have a level 17 Avenue-A blue sniper that hits like a truck, so I keep it for goofing around in low level content.