Thanks for the explanation of process...perfect! Field strip tomorrow. I may see if my old hockey gear still fits and don while field stripping lol.There is a consistent rule on this. The rod slot is in a fixed position related to the locking pin. The locked position in the bolt will have the slot in the vertical position. Yes, it can be rotated 360 degrees, well past the locking point. Also, there are notches in the bolt that you can feel when the pin seats itself properly. It will be evident with a slight easing of pressure on the rod, so that the cross pin can engage with the rearward facing notches in the bolt cavity. You will quickly develop a feel for that, but always combine that "feel" with the visual reference and you will have no problems.
The rule of thumb I suggest is that you depress the rod- bolt in full retracted position- with the rod slot in the horizontal position. That gives you a reliable visual as well as mechanical reference. Once fully depressed into the bolt cavity, rotate clockwise to the 90 degree point, where the slot is visibly vertical. Anything less... or more (past)... than straight vertical and your rod is not fully secured in the bolt. With practice you will get to know that feel, but the visual will be a great guide while developing that.