The victra-12 internal choke is a specialized choke that sits in the front of the suppressor, not in the shotgun's barrel.The choke of a shotgun determines shot string only.It has no bearing on shot speed (velocity) or distance (range).That is, the choke does not alter the shotgun's power it just controls how tight or spread out the pellets will be at a specific distance.Gauge: 12 GaugeFinish: Natural StainlessMaterial: 17-4 Stainless Steel