all states and places are different, can be different between towns also
for texas i believe with the castle doctrine you can have any size weapon.
for texas i know for fact you can have a handgun loaded open carried gun without a license being lawful
there is also constitutional carry clauses in multiple states also
yes sorry i didnt get everything out correctly, was busy at moment and forgot 2 words
can open carry on personal property, business if business allows(mine does), and in car(car is considered personal property like house)