I bought a WRM cylinder from a Ruger forum classifieds ad, and installed it in my early .22LR Bisley w/o any issues.
YMMV, however, since any given extra cylinder's arbor may be slightly overlong for YOUR Bisley's frame, and need a little fitting - and the cylinder/barrel gap checked for proper clearance.
You can either measure your KR cylinder and try to buy one with like or slightly smaller dimensions, providing a seller also measures correctly - or just take a shot and do it.
Extra cylinders are typically $50-60 or so.
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