The item I believe, is something other than a gun cylinder. At first glance the general shape may fool the eye into this thought, yet many key features are inconsistent with what we should be seeing for a revolver cylinder. First; I have never seen a
brass gun cylinder ever, as brass is much too soft of a metal to contain the pressure of gunpowder charge. Second; all the gun cylinders I have ever seen examples of (including the starter guns/blanks guns shown), have cylinders that are fully flush on both ends, and not with any type of recessed channel (what purpose would a channel have in a gun cylinder, further reducing the strength and function of the piece). Third; a gun cylinder requires a means of advancement each time the hammer is cocked and the trigger is pulled (this would be a radius set of raised slots or teeth on one end of the cylinder, where the advance mechanism would catch and turn the cylinder). Fourth, there appears to be rusty iron or steel in at least two of the holes or chambers on this piece, suggesting that at one time these were pins or bolts (note as well, evidence of hacksaw cuts going across the face, where these iron or steel pins were cut off).
The questionable features warrants this being reevaluated, and marked "Unsloved" in the meantime.
CC Hunter