I'm going to throw out the most popular American rifle; the AR-15. These are versatile, light, very customizable, easy and very fun to shoot, accurate, and simple to take down for cleaning or work. The 5.56mm is a decent cartridge and makes an excellent varmint caliber. And you can shoot .223 in an AR even though it is chambered for the 5.56 round. The standard capacity magazine holds thirty rounds, unless you life in a semi-communist state, and they are inexpensive to buy. So much going for this rifle, it really should be on every enthusiast's list.