What did you expect, 30 pound guns? It would be kinda hard to move if you have to lug around something that heavy.
Although newer guns like the M4 weigh less then some older guns like the AK 47, which weighs around 10 pounds. The reason is because, among other things, the M4 is made mostly of plastics and fiberglass, while the AK is made of iron and wood.
And while we are on the topic, this is the best site for firearm information I have ever found.







