OK, the H&K 416 is an interesting weapon. However, let me rephrase the question:What is the difference between and IAR and an M-16 on full-auto when used as a SAW? I see no real difference in firepower, capacity, rate of fire, or anything else between them. One's a piston and apparently can fire with the receiver underwater and the other (actually, an M4 and I asked about the M-16) explodes rather nastily if you try it.But as a SAW, what is the difference between the IAR and the M-16A3 as used by the Marines? What will the Marines get if they replace the SAW in a squad with a handful of IARs? I don't see the value.