you guys are aware that it is perfectly legal in the usa to build your own gun from scratch...aka 80% lowers. legal since something like 1967 or 1968, federal law, search it. I keep a hard copy of the law with every weapon I built from scratch. Thankfully I live in an area where everyone has a college degree, and has shot guns since age 12 or so.
Avoid that california bullshit, I dont and never would live in a communist liberal state like that. If I did, I'd have 80% built ar's and 1911's all over the place, and would probably be in jail by now for having a gun in my own home, in the off chance someone broke in and I shot them.
That being said, you can build your own and no one would know, although I wouldnt recommend that in california.
As an investment, not a great one, unless you get very rare weapon, or know certain things will be banned. years ago when clinton was in, 30rd+ mags were selling for many times their prior purchase value, as does ammo come every election season, especially fun or rare ammo.
Hell look at the pre ban M4/m16, what, $30k each now in the usa?
illegally, im sure there is a market there, but, you'd probably be in jail for eternity over a couple grand profit each. NOT worth it.
If you're buying incase of the SHTF scenario, guns are no good without lots of ammo, and that will cost a lot more than the guns in most cases. You dont really need the food supply, you can grow seeds and hunt, or you can just go take what the liberals have since they hate guns until you figure out your sustainability.
Gold will buy you refuge in a non war torn country.
In a sane non SHTF scenario, there are only a small handful of guns worth buying as an investment, and the more rounds ran through them the lower the value.
As an investment in fun memories, sure, a financial one, you better know what you're doing in the gun market.