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It depends on what you mean. There is no requirement to register firearms in the U.S.
If you mean from the United States, both the US and peru have laws regulating export of firearms from the US, and import of firearms into Peru.
There is no nationwide registration of ordinary firearms in the US. A few states have laws requiring registration of firearms in that state.
No.
US
All of them. Texas does not license firearms. As is the case with MOST US states
There are no exact records, since there is no national registry of ordinary firearms. It is ESTIMATED that about 310 million firearms are privately owned in the US.
Over 200 mil.
Legal today in the US
You have to be 21 to get a Federal Firearms License in ANY US state, territory, or protectorate.
No. The weapons they're issued are US government property, and are turned in when they're done with them. Some schools may award demilitarised or decommissioned firearms, but they're not service weapons.