The odd part of the Cutts story is that it was designed to keep a Thompson sub machine gun from rising in recoil at the time of discharge. However, the wildly popular Cutts Compensator sold for use in shotguns did not have vents that prevent the rise of the muzzle on discharge. The vents are equally situated on the top and bottom of the compensator body. After at least fifty years of using guns with Cutts Compensators in dozens of different shotguns, I still don't understand why the compensator body has vents at the bottom. The pictured, probably modified, Pachmayr Power Pac in my opinion is the proper use of vents in a shotgun barrel, in the top only. I agree with Researcher, the compensator in question is a modified Pachmayr Power Pac, never marketed in that configuration.
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