Internal makers and other countries in the word.
Yes. About one third of us that are adults do own guns. Legally.
18 for long guns 21 for hand guns
Despite belief to the contrary, in MOST of the US, there is no requirement to register ordinary guns.
Yes.
Trade
Yes
No one record. Estimates are about 310 million guns.
They use a lot of guns given them by the US BATF.
Like most of the US, there is no registration of guns in Texas.
1. Battleship USS New Jersey, 16" guns 2. US Navy heavy cruisers armed with 8" guns 3. US Navy light cruisers armed with 6" guns 4. US Navy destroyers armed with 5" guns 5. US Artillery: 175mm self propelled guns 6. US Artillery: 155mm self propelled guns 7. US Artillery: M56 SPAT 90mm self propelled anti-tank gun 8. US Artillery: M42 Duster; twin 40mm pom-pom guns 9. US Artillery: 8" inch guns 10. US Artillery: split trail 105mm and 155mm field guns (towed pieces) 11. USMC: M50 Ontos (six 106mm recoilless rifles)
Not in the US, but registry is required for ownership or possession of certain types of guns.
there is an unknown amount of guns used by the American army