Complex sentence: The main drawback of the G3 and AK4 lies in the choice of caliber: it is a superb weapon as a rifle, but impossible to handle in automatic mode, or even in short bursts.
Split into simpler sentences: The main drawback of the G3 and AK4 lies in it's choice of caliber. A superb weapon as a rifle, but impossible to handle in automatic mode-or even in short bursts.