Beretta Optima-Choke® HP Tubes Stand Up To The Heat Of Competition. Manufactured From High Strength Steel And Finished In a Nickel-Alloy Coating, These Chokes Guarantee Significant Corrosion Resistance And Have The Ability To Withstand The rigors Of Steel Shot. Optima-Choke® HP Tubes Are Fully Interchangeable On All Beretta Barrels That Are Threaded For Optima-Choke® HP