So the bolt only pops up partially when the gun is fully cocked. Enough to catch the cylinder bolt notch, but not all the way, so there's a bit of a jiggle in the cylinder at full cock. When watching the bolt movement without the cylinder in the gun, I can see the bolt rise some while cocking the hammer, and when I let the hammer fall slowly I can see the bolt come up the rest of the way. Basically, when the hammer starts to fall, the bolt fully engages the cylinder notch and there's a solid lock up, but at full cock the bolt isn't up in the notch far enough to create a tight lockup. What's the problem?