Unfortunately, I don't have any constructive input, but I do have a newb question. What is the advantage/difference between the 5.45 and the 7.62? Before I had any interest in long guns, I always assumed all AK's were 7.62. Now I know better, but I don't have the slightest idea what advantages one caliber has over the other or the physical differences in contruction of both rounds. A little enlightenment would be greatly appreciated