If you have ever used a semi-automatic shotgun to breach a door, you know that a breacher choke is super helpful to allow gasses to leave the muzzle and cycle the action. If you haven't breached a door with a shotgun, you're missing out. Snag one of these, toss it in the shotgun and get to blasting deadbolts (only doors you have access to and at your own risk). These are Benelli/Beretta Mobil Choke thread pitch and will fit any Wimberley Arms 12G model.