Now, before anyone jumps all over me about the title of my post, I know the difference between the two calibers. I just want to know - if a 7.62x51 is a .308, what would a 7.62x39 be? BTW, I love an AK for oh, home defense (need to find some frangible ammo for AK), hunting (have some Cor-bon and Hornady hunting ammo) , target shooting, plinking. I've modified my AK to be a homeland defence rifle, I've installed a skeletonized sniper stock, grip pod bipod, and a 4x scope. In keeping with homeland defence theme, I also have 15 thirty round magazines, 10 ten rounders, and 1 seventy five round drum. So if any foreign troops wish to invade the US, I can help repel them (even though my AK isn't select fire). And BTW, the AK-47 rifle as designed by Mikhail Kalashnikov is as bulletproof as it's rumoured to be, I've owned my AK since '96 or so and just now cleaned it for the first time (15 years later). It's never misfired, jammed, or had any other malady associated with not cleaning your weapon.