While I haven't learned this in detail (I loathe the AR10/AR15 design), I gather it's quite a bit easier than that, e.g. http://www.brownells.com/.aspx/lid=1100

While I haven't learned this in detail (I loathe the AR10/AR15 design), I gather it's quite a bit easier than that, e.g. http://www.brownells.com/.aspx/lid=11004/learn/ http://www.brownells.com/.aspx/lid=11004/learn/ Maybe six months if you're busy with a lot of other things. And of course a fair amount of mechanical aptitude is required, if you're learning that from scratch or nearly so (not the case for many of us in flyover country), it could indeed take quite a while. And more than a few ruined parts.