They were originally developed for defensive purposes where over penetration is an issue, i.e., in doors. They do state that they are really intended for double barrels and will not function in a semi-auto or most pump actions. A friend of mine just had an Ithica model 37 custom smithed to handle the short shells but says it will not work with regualr shells after t he modifications. George down in the Smithy forum may be able to explain the mods required to make them work in a pump.
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Gunslinger
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