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There have been a few comparisons of the M-16 and AK-47 in this thread.
The M-16 had a lot of problems initially, which led to it getting a bad reputation. The M-16 is designed to be an accurate weapon, so it has expensive, high tolerance parts. This is good for accuracy, but it makes the weapon more vulnerable to malfunctions due to dirt, crud, etc. The M-16 was actually issued to Vietnam without cleaning kits, and soldiers were told that cleaning the rifle wasn’t necessary. This was absolutely idiotic, and the soldiers learned really quickly that cleaning was in fact necessary. The M-16 had a few design flaws as well, but even though the mechanical design was fixed during the Vietnam era and proper cleaning practices were instituted, the M-16 still has a reputation for being a crappy weapon. Soldiers especially didn’t like the plastic stock. It was designed to make the weapon lighter, and therefore easier for the soldiers to carry around, but they saw it as a “cheap” weapon and often called it the rifle that was made by Mattel (the toy manufacturer).
The AK-47 has a completely different design philosophy. It’s parts are intentionally made cheap, and it was engineered with intentionally loose tolerances. This has a huge advantage when you are making enough of these for, say, the Russian Army. Would you rather have 10 guys armed with the more accurate M-16 or would you rather have 20 guys armed with less accurate AK-47’s? The old Russian philosophy was “quantity has a quality all its own” and they certainly followed this philosophy in the AK-47. The intentionally sloppy tolerances of the AK-47 not only make it cheap to manufacture, but they also give the AK-47 it’s legendary ability to survive getting dirty and still firing. This ability is often exaggerated, though. The AK-47 does jam less easily than an M-16, but the AK-47 isn’t some jam-proof super weapon. Get it dirty enough, and it will jam.
The AK-47’s cheap cost and ability to fire when dirty come at a cost. The sloppy tolerances mean that nothing fits tightly, and if you look at an AK-47 firing in slow motion you’ll see the end of the barrel just flopping all around. At close distances the AK-47 is reasonably accurate, but at longer distances you are reduced to spray and pray tactics.
The AK-47 does fire a heavier round. This was controversial when the M-16 was first produced. While at first this might seem like an advantage for the AK-47, it has a disadvantage too. In a video game, things are different. In the real world, logistics can win or lose battles. The lighter round of the M-16 is still quite deadly, and the increased accuracy of the M-16 means that you can use less ammo to get the job done. It also means that the soldier can carry more rounds. If you have the same number of supply trucks, the guys firing AK-47’s will run out of ammo long before the guys firing M-16’s will, and at that point the AK-47 becomes a club, and a club isn’t an effective weapon against an assault rifle.
Each weapon has its advantages and disadvantages. The M-16 is more accurate, but costs more. The AK-47 is cheap but you can’t hit the broad side of a barn with it (I’m exaggerating). The AK-47 packs more of a punch. The M-16 allows you to carry more ammo. There are pluses and minuses to both sides. They are two completely different weapons with two completely design philosophies.
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Getting back on topic, in the American Civil War soldiers very often scavenged off of the fallen soldiers on the battlefield. Both sides were using a mixture of old and new muskets, and weapons and ammo were both in short supply, especially at the beginning of the war. Weapons shortages affected the south more than the north, since the south had much more limited manufacturing capability. Many soldiers on both sides were using the older smooth bore muskets. In the movies, the skilled hero can hit things at amazing distances with a musket. In the real world, smooth bore muskets always fire curve balls. They are only accurate out to about 50 or 75 yards at the most. After that, you don’t know where that damn ball is going. The minie ball (which is a bullet shaped thing, not a ball) increased the range out to several hundred yards, so soldiers were darn quick to scoop up one of the newer weapons off of the battlefield if the chance arose. The more accurate rifled muskets were in use by both sides, and they both fired the same size ammunition (.58 cal minie ball), so if you managed to get a better weapon you didn’t have to worry about finding ammo for it.
Muskets have been found with several charges loaded into them. Some people have concluded that the soldiers were so terrified in battle that they continued to load their musket and hadn’t noticed that it wasn’t firing. What they were probably doing was intentionally stuffing up the barrel with charges (while retreating and abandoning weapons) so that the enemy couldn’t easily pick up the musket and use it against them in the battle. So, not only was scavenging will known during the civil war, but you actually had cases of anti-scavenging tactics being used.
Getting back to more modern times, I’ve heard of many soldiers taking AK-47’s in Iraq, but most of the cases I’m aware of they were taken for souvenirs. One guy I know shoved a bunch of AK-47’s into a truck tire and tried to smuggle them back to the U.S. I don’t know what his punishment was, but he got caught and didn’t end up with any AK-47’s. He didn’t mention spending time in a military prison or anything either.
In the heat of battle, I’ve heard of a few cases where there were mixed U.S. and Iraqi forces, with the U.S. guys armed with M-16’s and the Iraqi guys armed with AK-47’s. As the battles progressed, the M-16 guys would sometimes pick up AK-47’s off of the fallen Iraqis when the M-16’s ran out of ammo. This isn’t the same as running out into the battlefield and picking weapons up off of a dead guy while the shooting is still going on, though. The fallen Iraqis were in the same location as the guys with the M-16.