Just a few years ago the shooting community witnessed the rise of a new commercially available defensive platform subset: pistol-grip “firearms” with barrels shorter than 18", chambered for shotgun shells.
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Remington V3 Tac-13 12 Gauge 13 Barrel
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Tested: Remington V3 Tac-13 An Official Journal Of The NRA
Remington TAC-13, a nubby little semi-auto