Minors may own firearms that are given to them by their parents, relatives, or legal guardians. However, they may not generally possess firearms unsupervised until they are 18 years of age. There are exceptions to this rule, such as when a minor possessing a hunting license (and having passed a hunter's safety course) is hunting, possession of firearm(s) on certain types of private property, and possession of firearm(s) in one's own home.
NFA Firearms

Owning or possessing a short-barreled shotgun or rifle is illegal and a felony under state law, unless the short barreled firearm is registered under the National Firearms Act. Owning or possessing a fully automatic firearm is not illegal under state law, but is still illegal under federal law unless the automatic firearm is registered under the National Firearms Act. Local and State authorities are not obligated to enforce federal firearms law or notify federal authorities of federal firearms law violations, however they may, or may not, choose to do so.
Carrying Firearms in Public

Carrying a handgun in public circumstances or on public land requires a valid handgun carry permit, issued by the Oklahoma State Bureau of Investigation. Individuals must pass an extensive background check, meet certain requirements, be at least 21 years of age, and pass a firearms handling and safety course to be issued a permit.[4]
Restrictions on Carrying Handguns

Individuals possessing handgun carry permits may not carry handguns firearms of greater than .45 caliber. Individuals with handgun carry permits may not carry in an establishment whose primary purpose is the serving of alcoholic beverages. Handgun carry permit holders may not consume alcoholic beverages while carrying. Doing so will result in revocation of carry permit and possible criminal charges. Carry with permit is allowed in an establishment that serves alcoholic beverages, (such as a restaurant that serves alcoholic beverages) as long as that is not the primary purpose of said establishment. Handgun carry permit holders cannot carry into any sports arena during a professional sporting event, in an area or building where pari-mutuel wagering is authorized (such as a casino), cannot carry in schools nor in any government building.