| There's nothing wrong with the current M16A4 family of weapons. They will fire every time if fed the right ammo and properly maintained. They are modular, relatively inexpensive, accurate, and reliable (a function of the user).
The ballistic testing I have read indicates that the 5.7mm round remains intact and yaws base forward after a few inches of tissue and continues on a single small track. The .45ACP FMJ round disrupts a far wider permanent wound cavity than the 5.7, the .45 hollow points do even better.
In my opinion, the P90 might be an adequate weapon for pilots in lieu of the MP5 PDW, especially if it came in a more effective caliber or with a better bullet. I do not see it working as a replacement for the M-4 for most support soldiers. It also has very little real estate for mounting any additional hardware, like a light, laser, etc.
The HK 416 is pretty sweet, too. Some buddies of mine (SF) picked up the FN SCAR-L the other day and said it had terrible ergonomics, but they didn't fire it.
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Trust your hang.
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