<P> Regarding Title II weapons, the possession of automatic firearms (such as machine guns), short - barreled shotguns, and suppressors is prohibited . Possession of short - barreled rifles is allowed for ATF Curios and Relics license holders, or, if the rifle is historically accurate has an overall length of at least 26 inches, for members of a bona fide military reenactment group . While possession of a large - bore destructive device itself is not prohibited, possession of an artillery projectile, shell or grenade with over 1 / 4 ounce of explosive is prohibited . There is no prohibition against non-sporting shotguns (such as the Armsel Striker) deemed destructive devices by the ATF, nor is there one for AOWs (Any Other Weapons). There is a specific prohibition against the possession of firearms designed to appear as a wireless telephone . </P> <P> In Illinois, muzzleloaders and black powder guns are considered firearms . </P> <P> Air guns that are larger than . 18 caliber and that have a muzzle velocity greater than 700 feet per second are also regulated as firearms . </P> <P> Illinois has no stand - your - ground law, however there is also no duty to retreat . The use of force is justified when a person reasonably believes that it is necessary "to prevent imminent death or great bodily harm to himself or another, or the commission of a forcible felony ." There are some additional protections for defense against unlawful entry into a dwelling . </P>

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