I'm selling my LE6920, so should i get the LE6940, or go with the S&W M&P 5.45x39 and get a 5.56 upper? The 5.45 i think is neat because the ammo is so cheap. But i still like the 5.56 round. I am not interested in doing the 22LR drop in bolt. Suggestions? Wanna kill these ads? We can help!