I have no idea how legit this company is (very little info given). Maybe someone else knows?
www.sai.dk/silencers/shotgun.phpShotgun silencers
The shotgun silencers.
SAI manufactures shotgun silencers for 12 caliber single barrel shotguns, the silencer is also suitable for lesser caliber single barrel shotguns
This line is only suitable for shotguns and may not be used for other firearms.
Common to all is steel tube, and aluminium baffle set up and blued surface.
The SAI shotgun silencer is fitted with allen-screw clamping, only the front sight is removed. Can be fitted to most single barrel shotguns, pump, semi-automatic and single shot.
SAI recommends the silencer to be used with sub-sonic cartridges.
Data sheet for standard shotgun SAI silencers:
Model Fiting Thread Diameter Length Weight
12 caliber Allenscrew none 50 mm 455 mm 475g