Ported Turkey Choke TubesDesigned for the serious turkey hunter, each Super Full Choke has been specifically bored to throw the optimum pattern at short and long distances. Each choke is ported allowing gases to escape quickly reducing recoil and muzzle jump in the process. Each choke tube is manufactured from aircraft stainless steel and a blue non-reflective finish has been added. Additionally, each choke is knurled, allowing for fast, easy removal and insertion. This choke should not be used with steel shot.Fits: Browning Invector Plus 12 Gauge