The big thing these days seems to be building your own firearm. Can you do this?
Yes (most places in the U.S.), and its not particularly hard. But there are some caveats. Here are links to my series on this, using the AR-15 as an example.
Part 3 (Lower parts): http://www.theprepperjournal.com/2017/04/27/building-firearm-part-3-ar-15-lower-parts/
Part 4 (Upper parts): http://www.theprepperjournal.com/2017/05/08/building-firearm-part-4-ar-15-upper-parts/
Part 5 (“Manufacturing” the receiver): http://www.theprepperjournal.com/2017/07/25/building-firearm-part-5-manufacturing-ar-15-receiver/
Part 6 (Assembly and Results): http://www.theprepperjournal.com/2017/07/31/building-firearm-part-6-assembling-testing-ar-15/
My recommendation for your first build was to get a complete upper pre-built. I have written another article on how to build an upper for “advanced” builders:
I’ve given up consideration of the Ghost Gunner CNC mill; it’s a wonderful fantasy, but I just can’t justify the cost, and from what I can tell, it messes up a receiver now and again. I may still someday try out the molded receivers from ar15mold.com, but probably not any time soon.