This intermediate cartridge of Russian origin offers a widely available and low cost ammunition option. With significantly more stopping power than a 5.56 and slightly more power than the 30-30, 7.62x39 is a great solution for most hunting situations.
Side charging AR-15s also have many advantages including being easier to use with scopes and improved ergonomics. Bear Creek Arsenal side charging uppers are made from 7075 aircraft-grade aluminum billets.