If you have guns, it is wise to have some basic gunsmithing knowledge and tools. At the very least, you want to be able to maintain your firearms; it would be even better if you could make minor modifications and basic repairs without having to run to a possibly expensive or overworked professional.
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. My series on this, using the AR-15 as an example, has been submitted for publication, and I will update this with the links when available.
Part 1 (Laws): http://www.theprepperjournal.com/2017/04/04/building-your-own-firearms-part-1-the-laws
Part 2 (Methods): http://www.theprepperjournal.com/2017/04/10/building-your-own-firearms-part-2-the-methods/
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):
Part 6 (Assembly and Results):
My recommendation for your first build is to get a complete upper pre-built. I have written another article on how to build an upper for “advanced” builders, but don’t know where it will be published yet. I’m also looking into other possible ways of manufacturing your frame, such as the Ghost Gunner CNC mill and/or the AR15mold.com “poured” receiver.