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The industry standard on describing magazine extensions is based on standard 2 3/4" shells.
NO ONE mentions anything about 3" shells or 3 1/2" shells, probably figuring common sense would tell most people that longer shells will reduce the magazine capacity.
The top of the line magazine extensions are:
The Remington factory model
Vang.
Tank's Rifle Shop, which is a close copy of the Remington.
Wilson.
Choate.
Lesser versions are the Tac-Star, and bottom of the barrel is the plastic ATI.
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