Between us we can arm the whole block.
Most outsiders will be pretty hungry after a week. Good luck getting into our neighborhood.
It would take a little more organization than the rabble in the projects could muster.
The only way your neighborhood won’t end up turning on each other is if you create a defacto government within your enclave, and are able to enforce rules, feed your group, and keep those who run out from overcoming the group.
And all the time, the 5 guys with all the guns will be thinking — if we all get together, our families will survive, and we don’t have to defend the dead weight of the others.
I guess you will be OK if you are all equally armed, equally prepared, and never run out of food. Because as soon as you might be running out of food, it will be like the TV show “survivor”, with factions and plots, only for real, and for keeps.
Unless you all are have a very strong ethical and moral compass, and are willing to let your own families starve to death in the name of “society”.