The SIG 550 has four modes : Security (S), One round (1), Three-round burst (3) and Full automatic (hidden under the metal security which is removed if needed)

A selective fire firearm can be fired in both semi-automatic and any number of automatic modes by means of a selector. Some selective fire weapons utilize burst fire mechanisms that limit the maximum or total number of shots fired when in this mode. Common burst fire modes include two or three rounds. Image File history File links Download high-resolution version (2560x1920, 440 KB) poignée et détente du Fass 90, pontet en more normal. ... Image File history File links Download high-resolution version (2560x1920, 440 KB) poignée et détente du Fass 90, pontet en more normal. ... The SIG 550 is an assault rifle manufactured by SAN Swiss Arms (formerly SIGARMS) of Switzerland. ... This article does not cite its references or sources. ... Walther P99, a semiautomatic pistol from the late 1990s A semi-automatic firearm is a gun that requires only a trigger pull for each round that is fired, unlike a single-action revolver, a pump-action firearm, a bolt-action firearm, or a lever-action firearm, which require the shooter... M2 machine gun An automatic firearm is a firearm that will continue to load and fire ammunition as long as the trigger (or other activating device) is pressed or until it runs out of ammunition. ...

Selective fire weapons always have a semi-automatic mode, where the weapon automatically reloads the chamber after each round is fired, but requires that the trigger be pulled again before firing the next round. This allows for rapid and (in theory) aimed fire along with conservation of ammunition. In some weapons, the selection is between different rates of automatic fire and/or varying burst limiters. The selection is often by a small rotating switch usually integral with the safety catch, but there have been other ways of choosing the mode of fire. In firearms, the chamber is the part of the barrel in which the cartridge is inserted prior to being fired. ...

Some selective fire weapons offer a burst mode as the second option, where each pull of the trigger automatically fires a predetermined number of rounds (generally from 2 to 4), but won't fire any more until the trigger is pulled again. The current U.S. standard assault rifle, the M16A2, fires three rounds with each pull of the trigger when it is in burst mode. A common version of the Heckler & Koch MP5 submachine gun (widely used by SWAT teams and special operations military personnel) has the capability to fire two to four round bursts, or to be fired fully-automatically. This is also the case of the French FAMAS or the Swiss SIG 550. Some automatic cannons have larger burst limiters to coincide with higher rates of fire. The AK-47 is the worlds most common assault rifle. ... M16 is the U.S. Military designation for a family of rifles derived from the ArmaLite AR-15. ... In automatic firearms, burst mode or burst fire is a firing mode enabling the shooter to fire a predetermined number of rounds (usually 2, 3 or 4) at a time with a single pull of the trigger—this firing mode is commonly used in submachine guns, assault rifles and carbines. ... The Heckler & Koch MP5 is a family of submachine guns developed by German weapons manufacturer Heckler & Koch (HK) in the 1960s. ... An MP5A4 (fixed stock and 3-round burst trigger group), a popular modern submachine gun A submachine gun is a firearm that combines the automatic fire of a machine gun with the cartridge of a pistol, and is usually between the two in weight and size. ... Members of the 60th Security Police Squadrons Base Swat Team, Travis Air Force Base, wearing black uniforms stand with M-9 pistols ready behind concealing foliage. ... The FAMAS (Fusil dAssaut de la Manufacture dArmes de St-Etienne, Assault Rifle by St-Etienne Arms Factory) is an assault rifle in bullpup configuration designed and manufactured in France by the Saint Étienne arms factory, which is a member of the French government-owned GIAT Industries complex. ... The SIG 550 is an assault rifle manufactured by SAN Swiss Arms (formerly SIGARMS) of Switzerland. ...

The majority of selective fire weapons have a fully-automatic mode as the second option. With each pull of the trigger, the weapon continues to load and fire rounds until the trigger is released or the ammunition is depleted. The British L85A2; the American M16A1 of the Vietnam War; the ubiquitous Soviet-designed AK-47; the Israeli Galil; some variants of the Belgian FN FAL; the Chinese QBZ-95; the German G3 rifle; and the American M4A1 carbine are but a few examples of this type of selective fire weapon. M2 machine gun An automatic firearm is a firearm that will continue to load and fire ammunition as long as the trigger (or other activating device) is pressed or until it runs out of ammunition. ... L85A1 in use by C Company, 1 STAFFS, in a live firing exercise, during Operation GRANBY, 6 January 1991 As above SA80 (Small Arms for the 1980s) is a family of related arms that include the British Armed Forcess standard combat rifle. ... M16 (more formally United States Rifle, Caliber 5. ... Combatants Republic of Vietnam United States Republic of Korea Thailand Australia New Zealand The Philippines National Front for the Liberation of South Vietnam Democratic Republic of Vietnam People’s Republic of China Democratic Peoples Republic of Korea Strength US 1,000,000 South Korea 300,000 Australia 48,000... Avtomat Kalashnikova model 1947 g. ... The Galil is one of the standard assault rifles used by the Israel Defense Forces. ... The Fusil Automatique Leger, or Light Automatic Rifle (LAR). ... The QBZ-95 (Chinese: ; pinyin: Qīng Bùqiāng Zú; literally Light Rifle Family) is an assault rifle manufactured by Norinco for the Peoples Liberation Army, the armed forces of the Peoples Republic of China. ... The G3 (Gewehr 3) is a family of select fire battle rifles manufactured by Heckler & Koch. ... The M4 Carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16, all based on the original AR-15 made by ArmaLite. ... A carbine is a firearm similar to, but generally shorter and less powerful than, a rifle or musket of a given period. ...

Selective fire weapons are regulated in the United States under the National Firearms Act of 1934; their new manufacture for the civilian market was prohibited by the Firearm Owners Protection Act of 1986. The National Firearms Act (NFA), cited as the Act of June 26, 1934, Ch. ... The Firearm Owners Protection Act (FOPA) is a United States federal law that revised many statutes in the Gun Control Act of 1968. ...

See also

• List of firearms
• Bump fire - a technique to simulate fully-automatic firing with a semi-automatic rifle