The Reload
The most dangerous moment you will ever face in a tactical or combat situation is the reload. Milliseconds count here. A tactical reload swaps a partially used magazine for a fresh one while keeping the old mag for later use, whereas a combat or speed reload is a rapid, drop the magazine, change done on an empty chamber when you need to get back in the fight immediately. The combat is the quicker of the two, as you do not need to stow the partially used magazine before continuing the battle.