Check with Luke at
www.smokelessmz.com. Im sure he will know somebody with a 50cal take off or he can hook you up with a custom barrel.
I would not even bother with a factory barrel if i had to replace one. The aftermarket barrels are so much better. He stocks mostly 45s but can order you one in 50cal. My Savage barrel would never come close to a Douglas, Mcgowan or Pacnor and it was a pretty good one.
