Firstly why?
Second No
1) Want to get into the black rifle market.
2) 223/5.56 is the biggest waste of time round in a rifle. I mean if your a women you would love this round just as much as you like the 9mm. But if your a man's man you know that 7.62 bullet is as proven as the 45 ACP. I would ask for it in 7.62 x 51mm but even the cheap chinese stuff is way to expensive for a range only rifle.
3) Last & most importantly the uper's are completly interchangable with the 223 chamber ones. So if my girlfriend wants to fire it she can & won't complain about the recoil. Also 223 uper's are a dime a dozen and how many people you know with a 7.62 x 39mm AR 15?