Swaghauler:
I noted that you included the spectrum of chokes, but charging out of obscurity (my copy of the reproduction of the 1940 Stoeger Arms Catalogue, aka "the Shooter's Bible") are two more muzzle treatments a Cutts Compensator (yes, for a shotgun!) and a shot spreader. The Cutts compensator was popular in the 30s and was original equipment on Thompson Submachine Guns. It acted like an attached Mag-na-port treatment to help keep the muzzle-rise from, well, rising. The shot spreader looks sort of like a funnel that's flattened on two sides which are positioned top and bottom. The shot apparently is allowed to spread laterally but not in the vertical plane.
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"Let's roll." Todd Beamer, aboard United Flight 93 over western Pennsylvania, September 11, 2001.
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