Read up on the gas piston upgrade for an AR's operating system, and then decide if you prefer the 5.56 or the 7.62x39 option.
Either way, I have you covered--$750 your choice or bag 'em both for $1400.
Each on comes with three thirty-round mags.
First five pics are of the 5.56, second five pics are of the x39.
More pics available--give me an email address and I will forward.