Flash suppressors and barrel shrouds were seen as 'military' features, and were on the list of Federally defined features that could cause a rifle to be defined as illegal, if manufactured after the effective date of the Federal Assault Weapons Ban that went into effect in 1994 in the United States.
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For example, a manufacturer might have replaced a pistol grip with a thumb-hole stock, or a flash suppressor with a muzzle brake,in order to comply with legislation such as the (now expired) US Federal Assault Weapons Ban.