Anybody who's taken a look at modern automatic weapons such as the SIG 551, Steyr AUG and H&K G36 should have noticed that these have one thing in common: transparent plastic clips that lets the user see how many rounds (approximately) he's got left with a quick glance. With the Unreal engine's "scriptedTexture" feature, this should not be too hard to implement, or is it?
Stay groovy...
Stay groovy...