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System in firearms
is said to fire from a closed bolt or closed breech is one where, when ready to fire, a round is in the chamber and the bolt and working parts are forward
Closed_bolt
System in firearms
automatic open-bolt fire, it is caught and held in this manner whenever the trigger is released. In contrast to this, in closed-bolt guns, the trigger
Open_bolt
Submachine gun
blowback-operated, magazine-fed submachine gun that fires from a closed bolt. The closed bolt design increases the accuracy, which is particularly desirable
Heckler_&_Koch_UMP
Type of firearm mechanism
Bolt action is a type of manual firearm action that is operated by directly manipulating the turn-bolt via a bolt handle, most commonly placed on the
Bolt_action
Mechanical part of a firearm
rifles). In a closed bolt firearm, the bolt is in its foremost position upon firing. This is opposed to an open bolt firearm where the bolt is held rearward
Bolt_(firearms)
Type of firearm
autoloading) firearms is usually what is known as a closed-bolt firing system. In a closed-bolt system, a round must first be chambered manually before
Semi-automatic_firearm
Premature explosion of ammunition
assault rifles fire from a closed bolt, meaning that when ready to fire, there is a round in the chamber of the barrel and the bolt and working parts are in
Cooking_off
American machine gun
an air-cooled, belt-fed, gas-operated machine gun that fires from a closed bolt with a cyclic rate of 450 rounds per minute. Based on an 1889 design
M1895 Colt–Browning machine gun
M1895_Colt–Browning_machine_gun
Submachine gun
due to its ease of being converted to full auto. At the same time as a closed bolt being designed, per the BATF, the lower plastic receiver had to be retooled
Interdynamic_MP-9
Series of US military carbines based on the M4 carbine
fires from a closed bolt during semi-automatic fire, and from an open bolt during automatic fire which is labeled as "OBA" for Open Bolt Automatic. While
LWRC_M6
2022 wildfire in Washington, U.S.
The Bolt Creek Fire was a large wildfire on the western slopes of the Cascade Mountains in Washington along U.S. Route 2 in 2022. It burned north of the
Bolt_Creek_fire
Submachine gun
closed bolt gun, only the linear hammer and firing pin moved at the moment the trigger was squeezed, whereas the Thompson slammed home a heavy bolt and
M50_Reising
German automatic paratrooper rifle
Karabiner 98k bolt action standard service rifle, should be able to fire single shots from a closed bolt, provide fully automatic fire from an open bolt, feed
FG_42
Submachine gun manufactured by Colt
manufactured by Colt, based on the M16 rifle. The Colt 9mm SMG is a closed bolt, blowback operated SMG, rather than the conventional direct impingement
Colt_9mm_SMG
Russian submachine gun
The Bizon is a lightweight selective fire weapon that fires from a closed bolt, a feature that enhances the gun's practical accuracy. The weapon has
PP-19_Bizon
General-purpose machine gun (HK21)
recoiling bolt. The machine gun has a hammer striker and is fired from the closed bolt position, rare for general purpose machine guns. Firing from a closed bolt
Heckler_&_Koch_HK21
Submachine gun
configurations can be changed upon customer requests. The CS/LS7 uses blowback, closed bolt operation. The upper receiver is made of metal, while the lower receiver
CS/LS7
Family of Israeli submachine guns
internal cocking or hammer mechanism. While the open-bolt system is mechanically simpler than a closed-bolt design (e.g. Heckler & Koch MP5), it creates a noticeable
Uzi
Type of automatic firearm
rifle and uses the same closed-bolt roller-delayed blowback operation system. This makes the MP5 more accurate than open-bolt SMGs, such as the Uzi. The
Submachine_gun
Semiautomatic paintball marker
The Autococker is a closed-bolt semiautomatic paintball marker manufactured by Worr Game Products (WGP). It was one of the first paintball markers to
Autococker
Jamaican sprinter (born 1986)
Usain St. Leo Bolt (/ˈjuːseɪn/ YOO-sayn; born 21 August 1986) is a Jamaican retired sprinter. Widely regarded as the greatest sprinter of all time, he
Usain_Bolt
Belgian bullpup assault rifle
configuration. The F2000 is a selective fire weapon operating from a closed bolt. The rifle consists of two main assemblies: the barreled receiver group
FN_F2000
Submachine gun
bolt and carrier are one welded unit, and the action is a simple blowback, unlike the roller-delay system of the MP5. The Lusa fires from the closed bolt
Lusa_submachine_gun
Russian submachine gun
The PP-19 Vityaz is a selective fire submachine gun that uses a simple closed bolt, straight blowback method of operation. It is based on the AK-74 and
PP-19-01_Vityaz
Semi-automatic pistol
It is chambered in 9×19mm Parabellum. The Shuty V4 MP-1 pistol uses a closed bolt simple blowback action like the Heckler & Koch UMP. The lower and upper
Derwood_Shuty
NATO modular weapon system
carbine configuration, fire from a closed bolt to ensure maximum accuracy, or in machine gun mode, fire from the open bolt position to prevent cook-offs and
Stoner_63
American medium machine gun
bolt came forward, it chambered the fresh round, advanced the belt, and engaged the following round in preparation for loading. Once the bolt closed,
M1919_Browning_machine_gun
Method of locking used in firearms
bolt is a method of locking the breech (or rear barrel) of a firearm closed for firing. Johann Nicolaus von Dreyse developed the first rotating bolt firearm
Rotating_bolt
Method of bringing a firearm fully into battery
not have done so) to prevent out-of-battery firing. It is only used on closed bolt only firearms. Some firearms have a dedicated device to allow forward
Forward_assist
Submachine gun
gas-operated rotating closed-bolt action with short stroke gas piston, located above the barrel, with a foldable butt stock. The bolt group and fire selector
Type_79_submachine_gun
Defunct Florida based US firearm company
being an open bolt firearm, was too easy to convert to fully automatic fire. As such, the company redesigned the KG-9 to be a closed bolt firearm, known
Intratec
Russian general-purpose machine gun and its variants
machine gun series is an open bolt design, which improves heat management during automatic fire compared to closed bolt designs and helps avoiding the
PK_machine_gun
Light machine gun
590 mm (23.2 in) Cartridge 5.45×39mm M74 Action Gas operated, rotating bolt; closed bolt Rate of fire 600 rounds/min Muzzle velocity 960 m/s (3,149.6 ft/s)
RPK-74
Submachine gun
The Spectre is a linear-hammer fired blowback firearm operating from a closed bolt. The trigger group is double-action with a decocker. When the decocker
Spectre_M4
American machine pistol
future semi-automatic firearms were to be manufactured with a closed-bolt design as the open-bolt semi-automatics were considered too easy to illegally convert
MAC-10
Chilean submachine gun
SAF is a blowback-operated select-fire submachine gun, firing from a closed bolt. It is based on the Swiss SIG SG 540 assault rifle which was produced
FAMAE_SAF
Spanish battle rifle manufactured by CETME
fired from the closed bolt in semi-automatic and from the open bolt in full-auto mode. Later production models fire from only the closed bolt. The Model As
CETME_rifle
Assault rifle/Flechette rifle
externally one of the more conventional entrants to the ACR program. A closed bolt, gas operated, full stocked, magazine fed, conventionally laid out rifle
AAI_ACR
P12(ö) Radom vz. 35 Vis Pistol Close-quarters, sidearm Recoil-operated, closed bolt Poland - Browning Hi-Power FB Radom 9×19mm Parabellum 1939 ? 0.950 Occupied
List of German military equipment of World War II
List_of_German_military_equipment_of_World_War_II
Submachine gun
ammunition. The CS/LS5 has a short-stroke gas piston system which operates in closed bolt. It comes with a 21.6 cm barrel chambered in 9×19mm Parabellum cartridge
CS/LS5
British submachine gun
9x19mm Parabellum (ZX-5) and .45 ACP (ZX-7). The weapon was available in closed-bolt semi automatic with various barrel lengths and the ability to use magazines
Sterling_submachine_gun
United States automatic rifle family
the trigger group in front of the magazine. The operation fired from a closed bolt. The Cook automatic rifle was 30 inches retaining the barrel length of
M1918 Browning automatic rifle
M1918_Browning_automatic_rifle
Light machine gun
segment of the trigger produced fully automatic fire. It fires from a closed bolt, by using an internal hammer. Surplus units of the MG 13 were supplied
MG_13
Part of the trigger mechanism of a firearm
striker, or bolt back until the correct amount of pressure has been applied to the trigger, at which point the hammer, striker, or bolt is released to
Sear_(firearm)
Assault rifle
AR-101 and AR-102 fire from closed bolt in semi-auto and open bolt in full auto whereas the AR-103 and AR-104 open bolt fire only. List of ArmaLite rifles
ArmaLite_AR-100
Type of semiautomatic bullpup sniper rifle
rifle is designed around the barrel. The WA 2000 fires from a closed bolt and uses a bolt with seven locking lugs. It has either a single-stage trigger
Walther_WA_2000
Belgian compact personal defense weapon
acts as a foregrip for the shooter's support hand. The P90 fires from a closed bolt for maximum accuracy, and its design makes extensive use of polymers
FN_P90
3D-printable firearm
pressure-bearing parts, and readily available springs, screws, nuts and bolts. The total cost of production, assuming the user already owns a 3D printer
FGC-9
Submachine gun
in 9×19mm Parabellum. It is a gas-operated firearm featuring a closed, rotating bolt. These design features, rare in submachine guns, were chosen to
SIG_MPX
Czechoslovak machine pistol
a select-fire, straight blowback-operated weapon that fires from the closed bolt position. The .32 ACP cartridge used produces a very low recoil impulse
Škorpion
WWII-era German aircraft machine gun
switching from magazine to belt-fed ammunition, and from open-bolt operation to closed bolt operation, to allow it to be installed in synchronized applications
MG_17_machine_gun
Light machine gun
was too heavy to be used as an infantry support weapon. It employed a closed bolt system using a toggle locking system developed for the LMG25. Some guns
MG_29
Austrian bullpup assault rifle
rifle with a conventional gas-piston-operated action that fires from a closed bolt. It is designed as a modular weapon system that could be quickly configured
Steyr_AUG
Discharging of a firearm at a time not intended by the user
design and usage, such as the phenomenon of cooking off a round in a closed bolt machine gun, a mechanical malfunction as in the case of slamfire in an
Unintentional_discharge
.50-caliber heavy machine gun
Browning M2 is an air-cooled, belt-fed machine gun. The M2 fires from a closed bolt, operated on the short recoil principle. The M2 fires the .50 BMG cartridge
M2_Browning
Submachine gun
police carbine, but a full automatic version was made. It fires from a closed bolt. Its most notable feature is that it folds up into a very compact package
Hotchkiss_Type_Universal
American submachine gun
completely different to operate from the closed bolt and the carbine has a barrel length of 16.5 in (420 mm) (versus open bolt operation and barrel length of 10
Thompson_submachine_gun
Heavy machine gun
gun mounted above the upper wing. Although heavier than the Lewis, its closed bolt firing cycle made it much easier to synchronise to allow it to fire through
Vickers_machine_gun
Assault rifle
two. The MKb 42(W) fired from a closed bolt and used a hammer firing system, while the MKb 42(H) fired from an open bolt and used a striker for firing.
Maschinenkarabiner_42(W)
German 9×19mm Parabellum submachine gun
delayed blowback-operated 9×19mm Parabellum weapon. It fires from a closed bolt (bolt forward) position. The fixed, free-floating, cold hammer forged barrel
Heckler_&_Koch_MP5
Matching of warplane's gun and propeller
needed to have a round in the breech, the breech closed, and the action cocked (the so-called "closed bolt" position). Several widely used automatic weapons
Synchronization_gear
Type of firearm action
energy to cycle reliably or even keep the bolt closed when the gun is tilted up. Due to the required bolt weight (typically 1lbs/2lbs), blowback designs
Blowback_(firearms)
Mechanical arrangement
open-bolt markers, or on closed-bolt markers to prevent double feeding (feeding more than one ball when the bolt is open for loading). Closed-bolt markers
Ball_detent
Submachine gun Close-quarters, personal security Blowback (Delayed blowback), closed bolt United States Harrington & Richardson .45 ACP 550 1941 2.8-3.1 United
List of World War II weapons of the United States
List_of_World_War_II_weapons_of_the_United_States
Family of rifles manufactured by SIG Sauer
selective fire. It fires from a closed bolt, and it has a short-stroke push rod piston system. The gas piston pushes the bolt carrier rearward where it is
SIG_Sauer_SIG516
Reloading a weapon in a very short amount of time
weapon, but when well performed can afford a large speed advantage. With closed bolt weapons, the speed advantage is lost if they do not have a round in the
Speed_reload
American-made light machine gun
stock extended, it is 934 mm (36.8 in) in length. The weapon uses a closed bolt, gas operated and air‐cooled system using direct impingement very similar
Colt_IAR6940
German assault rifle
Ultimately, it was recommended that a hammer firing system operating from a closed bolt similar to Walther's design be incorporated into the MK 42 design. The
Maschinenkarabiner_42(H)
Submachine gun
with its stock fixed in the closed position, is legally considered a pistol in the United States. The gun is of a closed bolt, hammer fired, blow back operated
PPS_submachine_gun
Assault rifle
mechanism. The R4 is a selective fire, gas-operated weapon that fires from a closed bolt. As with the IMI Galil, the operating system is derived from that of
Vektor_R4
Automatic cannon
Required: 3.0 horsepower (2.2 kW) at 24 volts Clearing Method: Open Bolt, semi-closed bolt Safety: Absolute hangfire protection Case Ejection: Forward 1 Includes
Bushmaster_III
Semi-automatic pistol
Explosives (ATF) forced Interdynamic USA to redesign the firearm into a closed-bolt system, which was harder to convert to an automatic weapon. This variant
TEC-9
Russian compact assault rifle
long stroke piston. It uses the same rotating bolt group from the AS Val, and fires from a closed bolt. It has a more compact, top-folding buttstock and
SR-3_Vikhr
Family of firearms manufactured by SIG Sauer
telescoping stock. The SIGM400 is a semi-automatic firearm firing from a closed bolt and uses a direct impingement gas system. The M400 is offered as either
SIG_Sauer_SIGM400
Submachine gun
longer barrel. APC9 for RWS ACTION SE Gen. II SXF – prototype with a heavier bolt to accommodate the RWS ACTION SE Gen. II SXF round with higher pressures
Brügger_&_Thomet_APC
Family of military rifles
in that it combined closed bolt operation (fires from bolt forward/chambered cartridge) with open bolt operation (fires from bolt to the rear, no chambered
FN_SCAR
Russian light machine gun
semi-auto conversion process. Semi-auto RPD variants must also fire from a closed bolt, which requires the addition of a striker mechanism and other fire control
RPD_machine_gun
Submachine gun
plans to use a wooden buttstock for the MK-9. The MK-9 fires from a closed bolt with a selector switch allowing semi-automatic or full-automatic fire
Floro_MK-9
Submachine gun
made for the civilian market is sold as PMX-S. The Beretta PMX is a closed bolt and blowback operated submachine gun made by engineering plastic and
Beretta_PMX
Submachine gun
technology. The Taurus RPC9 was unveiled at IWA 2025, it features a roller locked bolt system and chambered in 9×19mm Parabellum. Bangladesh Bangladesh Air Force:
Taurus_SMT
Russia SR-2 Veresk 9×21mm Gyurza 1999–present SR-2M Russia Vityaz-SN closed bolt blowback operated Kalashnikov variant 9×19mm Parabellum 1990s–present
List of modern Russian small arms and light weapons
List_of_modern_Russian_small_arms_and_light_weapons
Submachine gun
German MP 40. The chief interest of the Favor was that it fired from a closed bolt—that is, the round was fed into the chamber by the action of the cocking
Rexim-Favor
Bullpup assault rifle
user's face can make it difficult to operate. The weapon fires from a closed bolt and has a hammer-type firing mechanism. On the left side of the receiver
OTs-14_Groza
WW2-era German assault rifle
features came from the MKb 42(H), with the hammer firing system and closed bolt coming from the MKb 42(W). With time, Hitler became aware of the troop
StG_44
3D-printable firearm
works without needing any commonly regulated, commercial gun parts. The bolt carrier assembly, a stress-bearing component, is manufactured from a 30cm
Urutau_(firearm)
Squad automatic weapon, Light machine gun
similar bolt components to the AR-15 and the various operations and quick change barrel of the Ultimax 100. The weapon fires from a closed bolt when firing
SureFire_MGX
Machine pistol
blowback operated and fires from a closed bolt, allowing for more accurate shooting than would be possible from an open bolt design. Ammunition is fed from
PP-91_Kedr
Semi-automatic rifle
The RDB operates using the short-stroke piston system, firing from a closed bolt. A gas regulator is built into the Barrel Assembly Group to allow the
KelTec_RDB
Semi-automatic carbine
gun, replacing the delayed-blowback Villar Perosa action with a new closed-bolt system with a loose firing pin that was cocked by a guided rod protruding
Beretta_M1918
Submachine gun
inwards to lock the closed bolt to the tubular receiver casing. This design change prevented accidental discharges when the bolt was left forward and
MP_18
American submachine gun
will interchange with an original Smith & Wesson M76 except for the bolt. The bolt is not interchangeable due to the reorientation of the extractor and
Smith_&_Wesson_Model_76
Fully automatic handgun
Micro-Uzis are available in open-bolt or closed-bolt versions. The weapon has an additional tungsten weight on the bolt to slow the rate of fire, which
Machine_pistol
Mechanical fastener
power tool cases closed, to multi-point cammed latches used to keep large doors closed. A deadbolt latch is a single-throw bolt. The bolt can be engaged
Latch
Soviet light support weapon and variants
fire of 800 rounds per minute, an empty weight of 5.5 kg (12.1 lb), an open-bolt design and quick-change barrels to enhance sustained fire. Kalashnikov Concern
RPK
American assault rifle
details as to how) the weapon can fire from the closed bolt in semi-automatic and switch to open bolt when firing in fully automatic, improving accuracy
M4_carbine
Light machine gun
Schmeisser. By 1910 the then-current model used cloth belts, fired from a closed bolt and could fire at around 600rpm. A 1915 model was produced which had
Bergmann_MG_15nA_machine_gun
U.S. Military adopted variant of the FN MAG
is a semi-automatic only configuration of the M240, and fires from a closed-bolt. The FMG 7.62 is similar to the M240 but with a one-piece instead of
M240_machine_gun
Light machine gun
of the MGA SAW, which features a barrel length of 9.75 in (248 mm). A closed-bolt variant of the MGA SAW, it retains all the features of the original MGA
M249_Squad_Automatic_Weapon
American rotary machine gun
another three are being loaded. The minigun is composed of multiple closed-bolt rifle barrels arranged in a circular housing. The barrels are rotated
M134_Minigun
Common long range firearm
machine guns fire from an open bolt in order to reduce the danger of "cook-off", while almost all rifles fire from a closed bolt for accuracy. Machine guns
Rifle
CLOSED BOLT
CLOSED BOLT
Surname or Lastname
English
English : variant of Cleaver.
Boy/Male
Shakespearean
Cymbeline' The Queen's son by a former husband.
Female
English
Old English flower name, CLOVER means simply "clover."
Surname or Lastname
English
English : topographic name for someone who lived near an outcrop or hill, from Old English clÅ«d ‘rock’ (only later used to denote vapor formations in the sky).French : from the Germanic personal name Hlodald, composed of the elements hlÅd ‘famous’, ‘clear’ + wald ‘rule’, which was borne by a saint and bishop of the 6th century.
Boy/Male
Australian, Biblical, Christian
Destroyer
Girl/Female
Tamil
Nimeelitha | நீமிலீதா
Closed
Nimeelitha | நீமிலீதா
Surname or Lastname
English
English : variant spelling Clow.
Surname or Lastname
English
English : variant spelling of Close.Americanized spelling of German Klaus.
Male
English
Anglicized form of Hebrew Kesed, CHESED means "increase." In the bible, this is the name of the 4th son of Nahor.
Surname or Lastname
English
English : topographic name for someone who lived by an enclosure of some sort, such as a courtyard set back from the main street or a farmyard, from Middle English clos(e) (Old French clos, from Late Latin clausum, past participle of claudere ‘to close’).English : from Middle English clos(e) ‘secret’, applied as a nickname for a reserved or secretive person.Dutch : variant of Claeys.Altered spelling of German Klose.
Girl/Female
American, Anglo, Australian, British, Christian, English, Jamaican, Portuguese
Clover; Flower Name; Fortunate; Mind; Heart; Spirit
Surname or Lastname
English
English : variant of Close 1.German : variant of Kloss.
Boy/Male
Hindu, Indian
Cloud; Grain Cooked with Milk
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Sindhi, Tamil, Telugu
Close; Clove
Girl/Female
Anglo Saxon English
Clover.
Boy/Male
Biblical
As a devil or a destroyer.
Girl/Female
Hindu
Closed
Biblical
as a devil, or a destroyer
Surname or Lastname
English
English : Devon variant of Clough.
Surname or Lastname
English
English : occupational name for a nailer, from an agent derivative of Old French clou ‘nail’. Compare Cloutier.Americanized spelling of German Klauer (or the variant Clauer) or of Glauer, a nickname from Middle High German glau, glou ‘intelligent’, ‘circumspect’.
CLOSED BOLT
CLOSED BOLT
Boy/Male
Arabic, Indian, Muslim
Merciful
Surname or Lastname
English
English : from Middle English, Old English dohtor ‘daughter’. The application is unclear; perhaps it was a surname acquired by the retainers of an heiress of an important family.
Girl/Female
Indian
Colour
Boy/Male
Tamil
Crown, Pavitra, Pure
Girl/Female
Hindu, Indian
Victory
Boy/Male
Indian
Gold coin (Name of grandfather of abu bin Thabit)
Surname or Lastname
English
English : habitational name from Sharperton in Northumberland, possibly so named from Old English scearp ‘steep’ + beorg ‘hill’, ‘mound’ + tūn ‘settlement’.
Girl/Female
Tamil
(Wife of Agni, The Lord of the fire)
Biblical
their secret; their cement
Girl/Female
Australian, Danish, Finnish, Greek, Russian, Ukrainian
Defender of Man
CLOSED BOLT
CLOSED BOLT
CLOSED BOLT
CLOSED BOLT
CLOSED BOLT
v. t.
To make into a closet for a secret interview.
v. t.
To make close.
v. t.
Nearly equal; almost evenly balanced; as, a close vote.
v. t.
Narrow; confined; as, a close alley; close quarters.
v. i.
To end, terminate, or come to a period; as, the debate closed at six o'clock.
v. t.
Difficult to obtain; as, money is close.
superl.
Tight; close; closely fitting.
v. t.
Concise; to the point; as, close reasoning.
adv.
In a close manner.
n.
To stop, or fill up, as an opening; to shut; as, to close the eyes; to close a door.
v. t.
Shut fast; closed; tight; as, a close box.
a.
Firmly barred or closed.
adv.
In a close manner.
v. t.
Short; as, to cut grass or hair close.
adv.
Close; closely.
v. t.
Strictly confined; carefully quarded; as, a close prisoner.
v. t.
To shut up in, or as in, a closet; to conceal.
n.
One who, or that which, closes; specifically, a boot closer. See under Boot.
imp. & p. p.
of Close
pl.
of Couple-close