Help Identifying a Revolver Cylinder

[GOHUNT]

I got this cylinder from who knows where. Figure it might have some value to someone, but I need help identifying it. It appears to be stainless, 6 rounds, .22 caliber ( a .22 mag round would only go in up to the brass but the brass wouldn't fit in), looks like it drops out of the frame with the pull of a pin (maybe). Any help would be appreciated.

 

[WTM]

looks like a ruger single 6 cylinder.

 

[iowavf]

I thought that to, but doesn't look like the one I have. Mine doesn't look like the third pic. Of course they could've changed before or after I got mine? Had it for at least twenty five years and bought it new.