My main defense rifle is a Springfield M1A and it is awesome (as well as long, heavy and expensive to shoot). So, I have been considering adding a lightweight 5.56 mm type semiautomatic rifle to my gun safe. I was leaning toward a Ruger Mini 14 or an AR-15 type rifle. But, recently I have discovered the Keltec SU16. It is less expensive than either of the aforementioned weapons, lighter and (according to the few reviews I have read) more reliable.