Fully automatic in the context of Belt (firearms)

Select fire is the capability of a weapon to be adjusted to fire in semi-automatic, fully automatic, or burst mode. The modes are chosen by means of a fire selector switch, which varies depending on the weapon's design. Some select-fire weapons have burst fire mechanisms to limit the maximum number of shots fired automatically in this mode. The most common limits are two or three rounds per trigger pull. Fully automatic fire refers to the ability for a weapon to fire continuously until either the feeding mechanism is emptied or the trigger is released. Semi-automatic refers to the ability to fire one round per trigger pull.

The presence of select fire modes on firearms permits more efficient use of rounds to be fired for specific needs, versus having a single mode of operation, such as fully automatic, thereby conserving ammunition while maximizing on-target accuracy and effectiveness. This capability is most commonly found on military weapons of the 20th and 21st centuries.

A lever action is a type of action for repeating firearms that uses a manually operated cocking handle located around the trigger guard area (often incorporating it) that pivots forward to move the bolt via internal linkages, which will feed and extract cartridges into and out of the chamber, and cock the firing pin mechanism. This contrasts to other type of repeating actions such as the bolt-action, pump-action, semi-automatic, fully automatic, and/or burst mode actions. A firearm using this operating mechanism is colloquially referred to as a levergun.

Most lever-action firearms are rifles, but some lever-action shotguns and a few pistols have been made. The Winchester Model 1873 rifle is one of the most famous lever-action firearms, but many manufacturers (notably Henry Repeating Arms and Marlin Firearms) also produce lever-action rifles. Colt produced the 6403 lever-action Colt-Burgess rifles from 1883 until 1885 and Mossberg formerly produced the Model 464 rifle.

The Haenel MK 556 (German: Maschinenkarabiner) is a gas-operated selective-fire 5.56×45mm NATO assault rifle designed by German company C.G. Haenel. The MK 556 was finalised in September 2020, and it is a fully automatic version of an earlier Haenel design, the CR 223, which was already in limited use by law enforcement agencies since 2017. On 14 September 2020, the Haenel MK 556 was selected by the German Armed Forces (Bundeswehr) as a replacement for the G36, before the decision was revoked over patent infringement and legal concerns.

In order to replace the G36, the German Federal Ministry of Defence put forth the "Assault Rifle System", which the MK 556 won, leading to a purchase of the rifle, which was withdrawn on 9 October 2020, citing suspicion of breaches of public procurement law and concerns about alleged patent infringements by C.G. Haenel to the detriment of the other bidder company, Heckler & Koch. The German Federal Defence Minister Annegret Kramp-Karrenbauer (CDU) had this communicated to the Defence Committee of the German Federal Parliament. The decision followed a crisis meeting with representatives of the procurement office. The offers of the bidders will be reassessed by the procurement office against this background.