Kirk does rotate the chambers--counter-clockwise.
I thought so, but I wasn't sure enough of my memory to say so. Thanks for pinning it down.
I wonder, is there any visible change in the lights on the front right portion of the rifle when he switches barrels?
If the whole thing is made of wood, I'm doubtful there was any wiring to make things light up.
Also, the three colors of the tubes are red, orange, and yellow--the same colors that are on the little rectangular buttons on one side and as the circles on the other side.
Interestingly, the tube that's "in line" with the barrel/emitter is at the apex of the equilateral triangle formed by the three tubes. Yet, when Shatner shoots the rock leading to Mitchell's demise, it looks like the tubes aren't in their locked position: it appears the apex of the triangle is actually down at the bottom. (I suppose there's a different name for "an apex that's at the bottom.")
Ed: It looks like it's antapex