I don't agree with Fred on his M-14 vs Ar-15 views, however, He is right is as much as you need to know how to use your weapon well, and the only way to do that is, practice,practice,practice! Something Fred also never adresses, what are you gonna do when they call Air Support? (got news for ya, Fred your M-14 ain't gonna help you much, there!)and at 500yds out they'll be able to put a couple of missles right up your ass! As I see it, like many other here have said the only way to TRY to take out a convoy is up close,so they can't call in A.S., and would be forced to handle it themselves, This would be risky, but the locals would have the advantage in as much as they know the terrain, and can pick the site for ambush that gives them an advantage. that's the only way you'd have a chance