A tour de force (that ok?)a lot to digest,thank you again for taking the time.
Actual barrel slide separation takes place fractions of a second after rearward
movement of both,this is the critical point.A more thorough reading of the post
is needed,probably more than one.As to the round geometry in the magazine
this one requires spatial thinking to understand sort of like the disconnector
function.I digress,much obliged.