Bernadette, If your talking about the Bond Arms Ranger II model number BAR II45419. The same cylinder handles both rounds, but it has interchangeable barrels.

the Bond arm ranger II is a 2 shot over/under derringer and does not use a cylinder you can buy extra barrels to change calibers

Bernadette, the members here are not Buds employees, just customers like yourself. You should ask Buds Customer Service directly at : 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button at the bottom right corner 9am to 9pm Mon-Sat and 11am - 7pm Sun (7 days a week).