The cylinder chamber to barrel line up is.done like all S&W revolvers. The locking bolt pressing up through a slot in frame and engaging a notch in cylinder holds cylinder in time to barrel. With yoke pressed in tight against the frame holding the cylinder in side to side alignment, center pin engaging it's hole in center of r recoil shield provides most of this and the yoke lock assists instead of lug on bottom of barrel engaging the front of the ejector rod. Once again the spring loaded ball in shroud was never meant to bottom out in notch on yoke. Yes, there is a V in the bottom of it, but the ramp had to end in some manner. Could have used a flat spot at the bottom and been just as effective.