One of the last guns retrieved from my late Uncle's collection. It is made by Pedersoli, looks like a Remington rolling block but is a .50 muzzleloader. Pull the hammer back, roll the "block" back and there is a breech plug/nipple there. Maybe I am a purist, but this is bizarre to me. I owned a functioning 50-70 antique Remington rolling block and I just don't get the point. Kinda like having a fiberglass sportscar kit that goes on a VW pan.