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Any standard AR15 lower will take a 22lr dedicated upper. And most 223/556 uppers (depending on barrel collar) will take a conversion kit chamber insert.
That said, I don't play in NFA land. The wait, the tax, etc. just get to me. Especially since I have friends with tax stamp collections to call on whenever I want to shoot full auto or SBR or suppressors...
But basically, to start either you build up as a rifle first, and then do the Form 1 ("making a SBR" application) and when you get your tax stamp back, you can buy and install the short barrel. Or start w/ a short barrel and build a "pistol" (w/ brace) then when the tax stamp comes in you can swap out to a stock.
Whichever direction you go, be aware of "constructive possession" - if you have a short barrel upper (or even just a short barrel) and no tax stamp and no AR lowers that are pistols then you could be charged wtih fed felony... Another reason I avoid the "pistol" AR types.
Finally, in California, I don't know if you can get ANY NFA items. I know full auto and suppressed is a no-no in the state, I would assume SBR/AOW would be as well.
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