<Li> Some states have state preemption for some or all gun laws, which means that only the state can legally regulate firearms . In other states, local governments can pass their own gun laws more restrictive than those of the state . </Li> <Li> Some states and localities place additional restrictions on certain semi-automatic firearms that they have defined as assault weapons, or on magazines that can hold more than a certain number of rounds of ammunition . </Li> <Li> NFA weapons are weapons that are heavily restricted at a federal level by the National Firearms Act of 1934 and the Firearm Owners Protection Act of 1986 . These include automatic firearms (such as machine guns), short - barreled shotguns, and short - barreled rifles . Some states and localities place additional restrictions on such weapons . </Li> <Li> Some states have enacted castle doctrine or stand - your - ground laws, which provide a legal basis for individuals to use deadly force in self - defense in certain situations, without a duty to flee or retreat if possible . </Li>

Is it legal to own automatic weapons in the usa
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