Ok, so I know pistols and hunting rifles but I know nothing about Assult Rifles. Anyways, I'm thinking of trading my old yamaha blaster to this guy for an Olympic Arms AR-15 A2 Assult Rifle. Like I said I dont know much about them, but he told me this one shoots .556 and .223 and it's fully modified. Ok, dumb question time...This is a style of M16 right? Any info you would have about this weapon would be useful. Thanks, here's a pic he sent me of the gun: