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It has a threaded barrel and some kind of muzzle device however it does not appear to be a muzzle brake nor can I find any description of what the device is so I suggest that you contact Arsenal and ask them what it is Phone: 702-643-2220 or https://www.arsenalinc.com/usa/contact_us/ Fax: 702-643-8860

Andre, the barrel is threaded with a Krinkov Muzzle Brake. That muzzle brake is listed here : https://www.budsgunshop.com/catalog/product_info.php/products_id/711015876/pap_pistol_krinkov_style_muzzle_brake