These are real drop-in barrels with concluded chambers and don't typically have to have any gunsmithing. In exceptional situations, the fitment could be necessary. In that scenario, be sure to see your local gunsmith for right installation. Beretta 92 Collection third Gen. Extended Threaded Barrel 9mm available for purchase. Therefore https://beretta-apx-muzzle-brake80998.wikigop.com/571786/the_ultimate_guide_to_beretta_cx4_storm_muzzle_brake