Trulock Sporting Clay Shotgun Choke Tube, Verona SX, 12 Ga, Skeet 1 SCVSX12718

Then simply insert the choke tube fully into the barrel until the proper sound is heard. Next turn the head half-way out and back to make sure the choke tube is fully submerged. Finally turn the head fully out and back again to let the choke tube seat fully.