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Kinda like having an extra dingus. Sounds like a great idea, but in the heat of the moment, what would you aim at.
The National Firearms Act, 26
U.S.C. 5845(b), defines "machinegun"
to include any combination of parts
designed and intended for use in converting
a weapon to shoot automatically
more than one shot, without
manual reloading, by a single function
of the trigger.
So a double-barreled shotgun is NFA as well?
The early doubles used two triggers, one for each barrel. These were located front to back inside the trigger guard, the index finger being used to pull either trigger, as having two fingers inside the trigger guard can cause a recoil induced double-discharge. Double trigger designs are typically set up for right-handed users.[1] In double trigger designs, it is often possible to pull both triggers at once, firing both barrels simultaneously, though this is generally not recommended as it doubles the recoil, battering both shooter and shotgun. Discharging both barrels at the same time has long been a hunting trick employed by hunters using 8 gauge "elephant" shotguns, firing the two two-ounce slugs for sheer stopping power at close range.
Later models use a single trigger that alternately fires both barrels, called a single selective trigger or SST. The SST does not allow firing both barrels at once, since the single trigger must be pulled twice in order to fire both barrels. The change from one barrel to the other may be done by a <broken link removed> type system, where a cam alternates between barrels, or by an <broken link removed> system where the recoil of firing the first barrel toggles the trigger to the next barrel. A double-barreled shotgun with an inertial trigger works best with full power shotshells; shooting low recoil shotshells often will not reliably toggle the inertial trigger, causing an apparent failure to fire occasionally when attempting to depress the trigger a second time to fire the second barrel. Generally there is a method of selecting the order in which the barrels of an SST shotgun fire; commonly this is done through manipulation of the <broken link removed>, pushing to one side to select top barrel first and the other side to select bottom barrel first. In the event that an inertial trigger does not toggle to the second barrel when firing low recoil shotshells, manually selecting the order to the second barrel will enable the second barrel to fire when the trigger is depressed again.
No...not unless you modify the trigger to fire both barrels at the same time.
SXS with double trigger is fine, because it still requires two pulls of a trigger to fire two rounds. (even if you do it at the same time)