You have probably all heard about it so far, but if not and your an Hk fan look into it. They've got a few mock guns coming in for SHOT and are aiming for Q4 2009. Both are pictured with 10 rounders, but the 556 will take 10 20 30 round mags. 762 will take the propriety 10 20 round mags from the 417. Magpul EMAGs will fit the 556 as will most other AR mags. Pins are moved, a problem for some and not for others. Guns will be US made with German Cold Hammer Forged Barrels, they probably have a machine here.