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Most of the early problems with the M16 were due to MacNamara's decision to drop the chrome lined bore from Stoner's original design...a cost saving measure that in hindsight was idiotic: in the humid climate of vietnam, it allowed the bore/chamber to get rusty. The other problem was with a paricularly dirty burning powder used in the original load for the weapon. Couple that with fairly unclear cleaning/maint. routines with the newly deployed rifles, and you had a recipe for problems. After about 2 years, they went back to chrome lining the bores, and switched powders. They instructed the troops as to how to maintain them, and you now have a VERY accurate, reliable weapon.
The AK is a wonderfully rugged design, and will survive much rougher treatment in terms of maint. than the M16, which is why it's a favorite of guerilla movements around the world, but it is nowhere near as accurate. Since 1974, the Russians/East Block countries swithced to the ak 74, which uses the same design, but a smaller caliber bullet.
The M4 and other weapons the U.S. military currently issue is the same basic rifle as the M16, but with a shorter barrel and a different stock...but the internals are the same. There is nothing inherently wrong with the design, and it still works today, and is still deployed today. In every picture you see of a soldier in Iraq, if he's not carrying a SAW or an M-60, what you see is a variation of an M16, like the M4 or CAR. (unless it's a sniper rifle).
The H&K you are referring to is most likely the MP5, which is considered a submachine gun, not a rifle. Although the DEA uses a .223 version, most of them around in law enforcement are 9mm. The US uses a 10mm (.40) version that is unique around the world, as far as I know. It is a very short firearm, used mostly for CQB/hostage rescue kind of stuff.
If anyone is interesested, pop over to the Israali special forces site and have a read..there is some very good info there. I'd post a link, but I'm too lazy lol. Google it, it's easy to find.
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