Twinbarrels

Twinbarrels refers to devices that use two parallel or sequentially arranged barrels, typically sharing a single frame or mechanism. The term is most commonly applied to firearms, where a twin-barrel configuration is used to provide two discharge avenues or firing opportunities from a single weapon.

In firearms, twinbarrel systems are most familiar as double-barreled shotguns. These can be configured in side-by-side forms, where the two barrels lie next to each other, or in over-under forms, where one barrel sits above the other. Many designs feature a break-open action, though variations include fixed-barrel and some repeating mechanisms. Trigger arrangements vary: some models use two triggers, one for each barrel, while others employ a single selective trigger or a hammerless action. The primary advantages cited for twinbarrel configurations are increased versatility, a second chance to hit, and differing choke or load options between barrels. Drawbacks include added weight, width, cost, and maintenance requirements, as well as legal or storage considerations in certain jurisdictions.

Outside of firearms, the term is used less consistently but can describe systems that provide two parallel pathways or outputs, such as twin-carburetor or twin-throat arrangements in historical or specialized engines. In contemporary usage, “twinbarrels” is less common outside of weaponry and historical engineering contexts.

Overall, twinbarrels denotes a dual-barrel configuration across various applications, with the firearm context—especially double-barreled shotguns—being the most prominent example. See also double-barreled shotgun, side-by-side shotgun, over-under shotgun.