Editing Double-barreled shotgun (section)

==Construction==
Modern double-barreled shotguns, often known as ''doubles'', are almost universally [[break action]], with the barrels hinge down at the rear to expose the breech ends for unloading and reloading.  Since there is no [[reciprocating motion|reciprocating]] [[action (firearms)|action]] needed to eject and reload the [[shotgun shell|shells]], doubles are more compact than repeating designs such as [[pump action]], [[lever action]], [[bolt action]], or [[semi-automatic shotgun|self-loading shotgun]]s.<ref>{{Cite book |last=Grooms |first=Steve |url=https://books.google.com/books?id=tY9BMQcTaV8C&dq=break-action+guns+are+shorter&pg=PA35 |title=Modern Pheasant Hunting |date=2005 |publisher=Stackpole Books |isbn=978-0-8117-3227-7 |language=en}}</ref>

===Barrel configuration===
{{see also|coach gun|sawed-off shotgun}}
Double-barreled shotguns (specifically break-action), come in two basic configurations:
* '''side-by-side''' (S×S) — the two barrels are arranged horizontally;
* '''over-and-under''' (O/U) — the two barrels are arranged vertically.<ref>{{Cite book |last=Wiles |first=Laurie Bogart |url=https://books.google.com/books?id=ilaaDwAAQBAJ&dq=Double-barreled+shotguns+come+in+two+basic+configurations&pg=PT92 |title=Shooter's Bible Guide to Shotgun Sports for Women: A Comprehensive Guide to the Art and Science of Wing and Clay Shooting |date=2022-08-02 |publisher=Simon and Schuster |isbn=978-1-5107-4504-9 |language=en}}</ref>

The original double-barreled guns were commonly all side-by-side designs, which was a more practical design for [[muzzleloader]]s. Early [[cartridge (firearms)|cartridge]]-firing shotguns also used the side-by-side action, because they kept the exposed [[hammer (firearms)|hammer]]s of the earlier muzzleloading shotguns from which they evolved. When [[hammerless]] designs started to become common, the over-and-under design was introduced, and most modern sporting doubles are over-and-under designs.<ref name="tbm">{{citation|title=Twin barrel myths: side-by-side vs. over-under |work=Guns Magazine |date=July 2010 |author=Barsness, John |url=http://findarticles.com/p/articles/mi_m0BQY/is_7_56/ai_n56222158/ |archive-url=https://web.archive.org/web/20111229063234/http://findarticles.com/p/articles/mi_m0BQY/is_7_56/ai_n56222158/ |url-status=dead |archive-date=2011-12-29 }}</ref>

One significant advantage that doubles have over single-barrel [[Repeating firearm|repeating]] shotguns is the ability to have more than one [[choke (firearms)|choke]] at a time.<ref>{{Cite book |last= |first= |url=https://books.google.com/books?id=g9QDAAAAMBAJ&dq=advantage+that+doubles+have+over+single-barrel+repeating+shotguns&pg=PA120 |title=Popular Mechanics |date=September 1967 |publisher=Hearst Magazines |language=en}}</ref> Some shotgun [[shooting sport]]s, such as [[skeet shooting]], use crossing targets presented in a narrow range of distance, and only require one level of choke.<ref>{{Cite book |last=Russell |first=James |url=https://books.google.com/books?id=csSPiG0ThHgC&dq=shotgun+skeet+shooting+require+one+level+of+choke&pg=PA209 |title=Precision Shooting: The Trapshooter's Bible |date=1998 |publisher=James Russell Publishing |isbn=978-0-916367-10-7 |language=en}}</ref> Other sports, like [[sporting clays]], give the shooter targets at differing ranges, and targets that might approach or recede from the shooter, and so must be engaged at differing ranges. Having two barrels lets the shooter use a more open choke for near targets, and a tighter choke for distant targets,<ref>{{Cite book |last=Blakeley |first=Peter F. |url=https://books.google.com/books?id=vMO3DAAAQBAJ&dq=open+choke+for+near+targets%2C+and+a+tighter+choke+for+distant+targets&pg=PT197 |title=Successful Shotgunning: How to Build Skill in the Field and Take More Birds in Competition |date=2003-08-01 |publisher=Stackpole Books |isbn=978-0-8117-4370-9 |language=en}}</ref> providing the optimal shot pattern for each distance.

The disadvantage lies in the fact that the barrels of a double-barreled shotgun, whether over-and-under or side-by-side, are not parallel, but slightly angled,{{citation needed|date=April 2019}} so that shots from the barrels converge, usually at "40 yards out". For the side-by-side configuration, the shotstring continues on its path to the opposite side of the rib after the converging point; for example, the left barrel's discharge travels on the left of the rib till it hits dead center at 40 yards (36.58&nbsp;m) out, after that, the discharge continues on to the right. In the over-and-under configuration with a parallel rib, both barrels' discharges will keep to the dead center, but the discharge from the "under" barrel will shoot higher than the discharge from the "over" barrel after 40 yards (36.58&nbsp;m). Thus, double-barreled shotguns are accurate only at practical shotgun ranges, though the range of their ammunition easily exceeds four to six times that distance.

Side-by-side shotguns are often more expensive, and may take more practice to aim effectively than an over-and-under. The off-center nature of the recoil in a side-by-side gun may make shooting the body-side barrel slightly more painful by comparison to an over-and-under, single-shot, or pump-action, lever-action shotgun. Gas-operated and Recoil-operated, designs will recoil less than either. More side-by-side than over-and-under guns have traditional "cast-off" stocks, where the end of the buttstock veers slightly to the right, allowing a right-handed user to point the gun more easily.<ref name="tbm"/>

Double-barreled shotguns are also inherently more safe,<ref>{{Cite book |last=Montague |first=Andrew |url=https://books.google.com/books?id=bZuhAQAAQBAJ&dq=Double-barreled+shotguns+are+more+safe&pg=PA116 |title=Successful Shotgun Shooting |date=2000-08-16 |publisher=Derrydale Press |isbn=978-1-4617-0270-2 |language=en}}</ref> as whether the shotgun is loaded or can be fired can be ascertained by anyone present if the action is broken open, for instance on a skeet, trap or hunting clays course when another shooter is firing; if the action is open, the gun cannot fire. Similarly, doubles are more easily examined to see if loaded than pump-action or semi-automatic shotguns, whose bolt must be opened and chamber closely examined or felt to make sure it is unloaded; with a double gun (or a break-action single gun), whether the gun is loaded, i.e., has cartridges in any chamber, is easily and immediately seen with a glance (and just as easily unloaded).<ref>{{Cite book |last=Markwith |first=Steve |url=https://books.google.com/books?id=hnG0DwAAQBAJ&dq=break-action+guns+are+easier+to+check&pg=PT249 |title=Shotguns: A Comprehensive Guide |publisher=Prepper Press |language=en}}</ref>

===Trigger mechanism===
The early doubles used two [[trigger (firearms)|trigger]]s, one for each barrel, located front to back inside the [[trigger guard]].  The [[index finger]] was used to pull either trigger, as having two fingers inside the trigger guard can cause a very undesirable recoil-induced double-discharge. Double-trigger designs are typically set up for right-handed users.<ref name="tbm"/> 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 shotgun and shooter, particularly if it was unanticipated or unintended. Discharging both barrels at the same time has long been a hunting trick employed by hunters using 8 gauge "elephant" shotguns, firing the two {{convert|875|gr|g|abbr=on}} slugs for sheer stopping power at close range.{{citation needed|date=November 2017}}

Later models use a single trigger that alternately fires both barrels, called a ''single selective trigger'' or ''SST''.<ref>{{Cite book |last=Wiles |first=Laurie Bogart |url=https://books.google.com/books?id=ilaaDwAAQBAJ&dq=single+selective+trigger+or+SST&pg=PT252 |title=Shooter's Bible Guide to Shotgun Sports for Women: A Comprehensive Guide to the Art and Science of Wing and Clay Shooting |date=2022-08-02 |publisher=Simon and Schuster |isbn=978-1-5107-4504-9 |language=en}}</ref> The single selective trigger 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 [[clockwork]] type system, where a cam alternates between barrels, or by an [[inertia]]l 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 (this also can happen if the first shell fails to fire). Generally there is a method of selecting the order in which the barrels of a single selective trigger shotgun fire; commonly this is done through manipulation of the [[Safety (firearms)|safety]], 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.

One of the advantages of double-barreled shotgun with double triggers or single selective trigger, is that the second shot can be taken almost immediately after the first with merely a second trigger pull, without needing to manually operate the action (which will inevitably destabilize the gun from the shoulder position and affect aim), and can utilize different chokes for the two shots (assuming, of course, that full power shotshells are fired, at least for a double-barreled shotgun with an inertial type single selective trigger, as needed to toggle the inertial trigger). This can be noticeably faster than a pump-action shotgun, which requires manually pumping the [[forearm (firearm component)|fore-end]] to eject and reload for the second shot, and may be faster, or not slower, than a semi-automatic shotgun (as there are no [[bolt (firearms)|bolt]] movements to delay the rechambering of a second shell). Note, however, in neither the pump-action or semi-automatic will the second shot be a different choke pattern from the first shot, whereas for a double, the two shots are usually with different chokes. Thus, depending on the nature of the hunt, the appropriate choke for the shot is always at hand. For example, while field hunting flushing birds, the first shot is usually closer than the second because the bird flies away from the shooter; so, the more open choke (and barrel) would be better for the first shot, and if a second shot is needed, as the bird is flying away, the more closed (and thus longer distance of an effective shot pattern) choke (and barrel) is then appropriate. Conversely, on a driven hunt, where the birds are driven towards the shooter, the closed (longer effective distance) choke (and barrel) should be fired first, saving the open (closer effective distance) choke (and barrel) for the now-closer incoming bird. None of this is possible with single-barrel shotguns, only with a double, either a side-by-side (S×S) or over-and-under (O/U).

===Regulation===
''Regulation'' is a term used for multi-barreled firearms (most commonly found in rifles and shotguns) that indicates how close to the same point of aim the barrels will shoot. A poorly regulated gun may hit consistently with one barrel but miss consistently with the other, making the gun nearly useless for anything requiring two shots. However, the short ranges and spread of shot provide a significant overlap, so a small error in regulation in a double is often too small to be noticed. Generally, the shotguns are regulated to hit the point of aim at a given distance <ref>{{Cite book |last=Currie |first=Don |url=https://books.google.com/books?id=lX89EAAAQBAJ&dq=Occasionally+a+set+of+over-under+barrel+will+not+be+properly+regulated.&pg=PA47 |title=Gunfitting: Achieving the Ideal Fit for the Game and Clay Shot |date=2021-12-01 |publisher=Rowman & Littlefield |isbn=978-0-8117-7037-8 |language=en}}</ref> usually the maximum expected range since that is the range at which a full choke is used and where precise regulation matters most. The regulation is usually more important in side-by-side rather than in over-and-under shotguns, as felt recoil differs.