Another vote for the "if it will penetrate enough in a human to stop them it WILL go through a wall". I can punch through drywall... I can't punch through a human chest. I completely understand your concern about neighbors though. I would focus on identifying safe lines of fire and beyond...
Surplus ammo and arms has sub $500 uppers. I just got a 16" HBAR upper complete with bcg and charging handle for $420 plus tax and shipping. Runs great so far :D
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