I've helped assemble a couple of FAL rifles with a friend of mine's father. I know the difference in build ease too as I was the gorilla on the end of the wrench helping to time/index everything just right. Also the days of cherry part's kits are long gone. Not saying a AR pattern rifle is super easy but compared to a FAL, M-14 or G3 build it's easier. And the later (G3) you really need the equal of a good metal working shop to do it right.