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B3 Barrel Choke Tube

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"Ported, heat-treated barrel choke; threads into the M37A2 barrel and ensures a more efficient release of gas, resulting in tighter spread."
Armat B3 Barrel Chokee Tube description (from Aliens: Colonial Marines - Arsenal Upgrades)
The B3 Barrel Choke Tube is a modification manufactured by Armat Battlefield Systems for the M37A2 Pump Shotgun.