Carlsons 18895, Browning Inv+ Ported Sporting Clay Choke Tubes, 12 Gauge Modified.720 Carlson's ported sporting Clays choke reduces recoil and at the same time reducing muzzle jump making follow up shots quick and easy Manufactured from 17-04 stainless steel and precision Machined to produce a choke that patterns better, with less recoil, than standard flush mount choke tubes These chokes feature a 25% longer Parallel section in the choke which allows for tighter, denser patterns, with less Flyers another words more pellets on the target