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It depends on what you mean. You can transport a handgun in the U.S. but each state has it's own requirements. The general requirements are, the gun must be unloaded and inacessible, however, some states allow people to carry loaded guns in the car. If you have a handgun carry permit, you can carry in some states. Again, you should check the state laws to see what the require in whichever state you are located or going to.
Every state is different.
In general, any felony makes you inelligible to own a handgun.
If you mean in the U.S. it depends on state law, but also, what you mean by "gun license." Each state sets its own requirements for issuing handgun carry permits. Most states do not require a permit for owning a handgun.
It depends on what the crime is that is on your record. If it is a felony, you can't legally own a handgun anywhere in the U.S.
If you have a handgun carry permit, definitely. The handgun carry permit covers "any handgun that you legally own or posses."
By federal law you may own or possess a handgun at age 18, but you cannot purchase handgun ammo or a handgun from a dealer until age 21.
To legally purchase or own a handgun, you must be 21.
By federal law you may own or possess a handgun at age 18, but you cannot purchase handgun ammo or a handgun from a dealer until age 21.
21
18 for a shotgun/hunting rifle, and 21 for a handgun.
As long as you have a Maryland handgun permit and as long as the gun meets any specific requirements in Maryland law.