Murray, Borchardt Rifle Company makes cylinders for the Single Six >>> http://rugercyl.com/ruger-cylinders/ ....or contact Ruger direct - Newport, NH 336-949-5200 (Monday through Friday 8:00am - 5:00pm ET), Prescott, AZ 336-949-5200 928-541-8835 (Monday through Friday 6:00am - 4:00pm MST), or Mayodan, NC 336-949-5200 (Monday through Friday 8:00am - 5:00pm ET)

Contact Ruger here https://ruger.com/service/partsService.html they will tell you to send in the gun as the new cylinder will require fitting (I did this)

Murray, unfortunately buds doesn't sell cylinders for the Ruger single six. Your best option to find one is by checking a website called gunbr0ker. They're a site that allows private owners and small shops to sell their products so they usually have rare and hard to find firearms and accessories. Sorry but hope this helps.

Murray, the Ruger Single Six New Model has a Six (6), Eight (8) or Ten (10) round Cylinder (Your Choice) available here (1st 3 listed) : http://rugercyl.com/ruger-cylinders/ --- Cheers and stay safe!