A 223/5.56 NATO carbine that accepts AR mags, Kel Tec assembles them using Philips head screws which proliferate throughout. Articles on the net indicate excellent reliability if not match grade accuracy. They appear simple like a 10-22 with no attachments except the top rail. It's odd that these haven't crowded out the AR market due to their low price ($449 on Gunbroker). Does anyone have an SU-16?