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Hi Ricardo and welcome. Yes Sir, the barrel is non-threaded and the compensator's unique quick-detach (QD) design allows for toolless install and removal from the proprietary non-threaded QD barrel. Cheers and stay safe! the compensator's unique quick-detach (QD) design allows for toolless install and removal from the proprietary non-threaded QD barrel. -- https://fnestore.com/fn-545-compensator-barrel-accessory?srsltid=AfmBOoqBhBOmus9y3BSoiLPPUtvZnEq5Rodsu3ErqXZbM11tDsICFCE7
Hi Ricardo, yes sir, this does not have a threaded barrel, so it is Illinois legal. The compensator's unique quick-detach (QD) design allows for tool-less install and removal from the proprietary non-threaded QD barrel. Stay safe & have a great day!
