Manufacturer: Hevi-Shot 560124
Specifications and features:
Beretta Optima Plus, Model 391 Extrema, Teknys, and Silver Pigeon II, III 12 gauge extreme-range waterfowl choke tube
For pass shooting or longer-great for sea ducks.
Ported, knurled forend
Internal axial rings keep shot cloud on target
Aircraft stainless steel
Matte black finish
Porting drops gas pressure at the muzzle, helps ease the wad away from the shot, reduces recoil, and dampens muzzle jump.
Extreme range choke tubes are NOT recommended for steel pellets larger than BB or excessive speed of more than 1550 fps.