Six-round conversion cylinder converts steel frame, cap and ball revolvers to modern centerfire. Patterned after an original Remington design for a drop-in fit. Cylinder and back plate fit together without screws. To reload, just drop the cylinder, pull the plate off and dump the fired cases. Use in steel frame guns only, with black powder equivalent loads. No FFL required to purchase. Models for .44 caliber, 1858 Remington Italian replicas, Uberti and Ruger Old Army are chambered for the .45 Colt cartridge. Your bore should be slugged and verified to be capable of running a .451-452" diameter projectile by a qualified gunsmith. This is for STEEL frame 44 cal.onl Mfg: Taylors And Co. SPECS: Blued steel or stainless steel as indicated. May require fitting to base pin.