Two questions:

#1 -- Why the IAR not in 7.62 mm? Does using 5.56 mm for the IAR not just reinstate the lost full-auto option on the M16/M4 without really adding firepower?

#2 -- 30 rounds of 5.56 mm might in some situations be a little ... tight. What's the opinion here about using an adapted Beta C-mag for the IAR? Or a belt-drum?