Something I observed the other day and pointed out to ReFlex, it was interesting to note on the AK-74u SMG that if you empty the clip and reload, it takes about 33% longer to reload than if you replace a partially used magazine. You'll notice the side mounted clip is pulled by the player to indicate a completely replaced magazine. Otherwise the player with simply dispose of the mag and put a new one in. Try it for yourself, and make use of it if you can. I know I have found that info useful at least 3 times I can remember.