So far I've built both AK's and an AR. The AR is really easy, AK's require a lot more work.
Machinisttx, just curious but, did you buy a "kit" for your AR builds or just source all the parts yourself? I've been wanting to build an AR for awhile, though I still have a few months before I can afford to build what I want (I'm really wanting to do an AR10). If you have any advice, I'd love to hear it.
Anybody building anything from a kit? I'm even half tempted to buy a black powder kit just for the fun of the build even though the end result is a black powder firearm.