Recently I questioned the effectiveness of suppressed shotguns. This is what a reader sent me …
I read the article about the suppressed shotgun and your question about the effectiveness of the sound reduction. Then I remembered a brochure I picked up at the IWA guntrade-fair in Neurenberg-Germany some years ago about the Laporte Swing Trap shotgun with the integrated suppressor, which reduces 15 % noise with standard ammo and up to 75 % with subsonics. I can not validate this claim because I have only held the gun at the IWA and never fired it, but maybe it is of interest to the readers of the blog.
The company does not appear to manufacture them anymore.
UPDATE: Mark sent me the patent for the Laporte shotgun suppressor. It is an interesting design. Also of note is that the shotgun has a very short barrel (relative to the normal length of these trap guns). The PDF can be viewed after the jump.