First, a quick primer on recoil
Excellent material,Newton applies and indeed equal force is applied in opposite
sides however the work is different on each side,my guess is that assuming
instantaneous detonation it is easier to send a bullet flying down the barrel than
to overcome the combined resistance of the slide ,wouldn't this result in
a delayed slide motion?that is to say bullet's well on its way before slide(and barrel) begin the cycle.Not to cast any aspersions on the compound guide rod
but I feel I've to mention it to continue this way more instructive topic.