Extended choke with diagonally-ported design for recoil reduction. Conical/parallel internal configuration. Easy to install and remove with your fingers. No special wrench or tool required. Fits barrels with Optima HP style threads. Beretta has multiple thread systems that are very similar to one another but not interchangeable. To ensure that you receive the correct chokes, it is important that you compare your existing chokes with the measurements and photographs provided on this page.