These are genuine drop-in barrels with finished chambers and do not normally call for any gunsmithing. In rare instances, the fitment may be demanded. In that circumstance, make sure you see your local gunsmith for proper set up. Beretta 92 Collection third Gen. Extended Threaded Barrel 9mm available for sale. https://gunsandammunation.com/shop/beretta-typhoon-muzzle-brake-1-2x28-9mm/