Maarkhoor
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Intro:
TheM4 carbineis a shorter and lighter variant of theM16A2assault rifle. The M4 is a5.56×45mm NATO, air-cooled,direct impingementgas-operated, magazine-fed carbine. It has a 14.5 in (370 mm) barrel and atelescoping stock.
The M4 carbine is heavily used by theUnited States Armed Forcesand is replacing the M16 rifle in mostUnited States ArmyandUnited States Marine Corpscombat units as the primaryinfantryweapon.[7][8]
The M4 is also capable of mounting theM203 grenade launcher. The distinctive step in their barrel is for mounting the M203 with the standard hardware. TheM4is capable of firing insemi-automaticandthree-round burst(like the M16A2 and M16A4), while theM4A1is capable of firing in semi-auto andfull automatic(like the M16A1 and M16A3).
Specifications
Weight 6.36 lb (2.88 kg) empty
7.5 lb (3.4 kg) with 30 rounds
Length 33 in (840 mm) (stockextended)
29.75 in (756 mm) (stock retracted)
Barrel length 14.5 in (370 mm)
Cartridge 5.56×45mm NATO
Caliber 5.56 mm (.223 in)
Barrels 1
Action Gas-operated, rotating bolt(Direct impingement)
Rate of fire 700–950 round/min cyclic
Muzzle velocity 2,900 ft/s (880 m/s)
Effective firing range 500 m (550 yd)
Feed system 30-round box magazine or other STANAG magazines. Magazines with different capacities also available.
Sights Iron sights or various optics
Manufacturer:
M4 MWS (Modular Weapon System
Colt Model 925 carbines were tested and fitted with the Knight's Armament Corporation (KAC) M4 RAS under the designation M4E2, but this designation appears to have been scrapped in favor of mounting this system to existing carbines without changing the designation. The U.S. Army Field Manual specifies for the Army that adding the Rail Adapter System (RAS) turns the weapon into the M4 MWS orModular Weapon System.
M4A1
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
The M4A1 carbine is a fully automatic variant of the basic M4 carbine intended for special operations use. The M4A1 has a "S-1-F" (safe/semi-automatic/fully automatic) trigger group, while the M4 has a "S-1-3" (safe/semi-automatic/3-round burst) trigger group. The M4A1 is used by almost all U.S special operation units including, but not limited to, Marine Force Recon, Army Rangers, Army Special Forces, Navy SEALs, United States Air Force Pararescue and Air Force Combat Control Teams. The M4A1 is especially favored bycounter-terrorist and special forces units for close quarters combat and urban warfare because of the carbine's compact firepower.[citation needed] It has a maximum effective range of about 500 to 600 meters (550–660 yd).[6] The fully automatic trigger gives a more consistent trigger pull, which leads to better accuracy.[32] According to Mark A. Westrom, owner of ArmaLite, Inc., automatic fire is better for clearing rooms than burst fire.[33]
In the last few years, M4A1 carbines have been refit or received straight from factory with barrels with a thicker profile under the handguard. This is for a variety of reasons such as heat dissipation during full-auto, and accuracy as a byproduct of barrel weight. These heavier barrel weapons are also fitted with a heavier buffer known as the H2. Out of three sliding weights inside the buffer, the H2 possesses two tungsten weights and one steel weight, versus the standard H buffer, which uses one tungsten weight and two steel weights. These weapons, known by Colt as the Model 921HB (for Heavy Barrel), have also been designated M4A1, and as far as the government is concerned the M4A1 represents both the 921 and 921HB.
Conversion of M4s to the M4A1 began in 2014, the start of all U.S. Army forces being equipped with the automatic variant.[34] Though in service with special forces, combat in Afghanistan showed the need for providing automatic suppression fires during fire and movement for regular soldiers. The 101st Airborne Division began fielding new-built M4A1s in 2012, and the U.S. 1st Infantry Division became the first unit to convert their M4s to M4A1-standard in May 2014. Upgrades included a heavier barrel to better dissipate heat from sustained automatic firing, which also helps the rifles use the M855A1 EPR that has higher proof pressures and puts more strain on barrels. The full-auto trigger group has a more consistent trigger pull, whereas the burst group's pull varies on where the fire control group is set, resulting in more predictable and better accuracy on semi-automatic fire. Another addition is an ambidextrous selector lever for easier use with left-handed shooters. The M4-M4A1 conversion only increases weapon weight from 7.46 lb (3.38 kg) to 7.74 lb (3.51 kg), counting a back-up iron sight, forward pistol grip, empty magazine, and sling. Each carbine upgrade costs $240 per rifle, for a total cost of $120 million for half a million conversions. 300 conversions can be done per day to equip a brigade combat team per week, with all M4A1 conversions to be completed by 2019
Mark 18 CQBR
The Mk 18 Close Quarters Battle Receiver is an M4A1 with a 10.3-inch barrel upper receiver.[37] Current contractors for the Mark 18 are Colt and Lewis Machine & Tool (LMT) NSN 1005-01-527-2288.
Enhanced M4
For the Individual Carbine competition, Colt submitted their Enhanced M4 design, also known as the Colt Advanced Piston Carbine (APC). The weapon has a suppression-ready fluted barrel, which is lighter and cools better than previous M4 barrels. It is claimed to have "markedly better" accuracy. To improve reliability, Colt used an articulating link piston (ALP) which "reduces the inherent stress in the piston stroke by allowing for deflection and thermal expansion".[38] In traditional gas piston operating systems, the force of the piston striking the bolt carrier can push the bolt carrier downwards and into the wall of the buffer tube, leading to accelerated wear and even chipped metal. This is known as carrier tilt. The ALP allows the operating rod to wiggle to correct for the downward pressure on the bolt and transfers the force straight backwards in line with the bore and buffer assembly, eliminating the carrier tilt. This relieves stress on parts and helps to increase accuracy.[39] The Individual Carbine competition was canceled before a winning weapon was chosen.
M4 Commando
Though Colt has focused its attention on carbines with 14.5-inch barrels and rifles with 20-inch barrels, Colt continues to make carbines with 11.5-inch barrels, which it calls Commandos. Originally, Commandos were assembled from whatever spare parts are available, so Model 733 Commandos could have A1-style upper receivers with case deflectors or A2-style upper receivers, and M16A1-profile 1:7 or M16A2-profile 1:7 barrels. Depending on the specific models, Commandos may have had three-position fire control groups (safe/semi-automatic/three-round burst), or four-position having both full-automatic and burst. The modern Model 933 has a "flattop" receiver, with a removable carrying handle and a MIL-STD-1913 Picatinny rail, with semi-automatic and automatic fire. The Model 935 Commando has the features of the Model 933, but has three-round burst fire instead of automatic. Though originally called the M16A2 Commando, Colt markets them as the M4 Commando.
Armwest LLC M4
In 2014, American firearms designer Jim Sullivan provided a video interview regarding his contributions to the M16/M4 family of rifles when working for Armalite. A noted critic of the M4 he illustrates the deficiencies found in the rifle in its current configuration. In the video, he demonstrates his "Arm West LLC modified M4", with enhancements he believes necessary to rectify the issues with the weapon. Proprietary issues aside the weapon is said to borrow features in his prior development, the Ultimax. Sullivan has stated (without exact 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. The weight of the cyclic components of the gun have been doubled (while retaining the weapons weight at less than 8 pounds). Compared to the standard M4 which in automatic fires 750-950 rounds a minute, the rate of fire of the Arm West M4 is heavily reduced both to save ammunition and reduce barrel wear, the reduced rate also renders the weapon more controllable and accurate in automatic firing

TheM4 carbineis a shorter and lighter variant of theM16A2assault rifle. The M4 is a5.56×45mm NATO, air-cooled,direct impingementgas-operated, magazine-fed carbine. It has a 14.5 in (370 mm) barrel and atelescoping stock.
The M4 carbine is heavily used by theUnited States Armed Forcesand is replacing the M16 rifle in mostUnited States ArmyandUnited States Marine Corpscombat units as the primaryinfantryweapon.[7][8]
The M4 is also capable of mounting theM203 grenade launcher. The distinctive step in their barrel is for mounting the M203 with the standard hardware. TheM4is capable of firing insemi-automaticandthree-round burst(like the M16A2 and M16A4), while theM4A1is capable of firing in semi-auto andfull automatic(like the M16A1 and M16A3).
Specifications
Weight 6.36 lb (2.88 kg) empty
7.5 lb (3.4 kg) with 30 rounds
Length 33 in (840 mm) (stockextended)
29.75 in (756 mm) (stock retracted)
Barrel length 14.5 in (370 mm)
Cartridge 5.56×45mm NATO
Caliber 5.56 mm (.223 in)
Barrels 1
Action Gas-operated, rotating bolt(Direct impingement)
Rate of fire 700–950 round/min cyclic
Muzzle velocity 2,900 ft/s (880 m/s)
Effective firing range 500 m (550 yd)
Feed system 30-round box magazine or other STANAG magazines. Magazines with different capacities also available.
Sights Iron sights or various optics
Manufacturer:
- Colt Defense
- LMT
- Bushmaster
- U.S. Ordnance
- Remington Arms Company
- THOR Global Defense Group
- SME Ordnance
- FN Herstal
- Sarsılmaz Arms
M4 MWS (Modular Weapon System

Colt Model 925 carbines were tested and fitted with the Knight's Armament Corporation (KAC) M4 RAS under the designation M4E2, but this designation appears to have been scrapped in favor of mounting this system to existing carbines without changing the designation. The U.S. Army Field Manual specifies for the Army that adding the Rail Adapter System (RAS) turns the weapon into the M4 MWS orModular Weapon System.
M4A1
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

The M4A1 carbine is a fully automatic variant of the basic M4 carbine intended for special operations use. The M4A1 has a "S-1-F" (safe/semi-automatic/fully automatic) trigger group, while the M4 has a "S-1-3" (safe/semi-automatic/3-round burst) trigger group. The M4A1 is used by almost all U.S special operation units including, but not limited to, Marine Force Recon, Army Rangers, Army Special Forces, Navy SEALs, United States Air Force Pararescue and Air Force Combat Control Teams. The M4A1 is especially favored bycounter-terrorist and special forces units for close quarters combat and urban warfare because of the carbine's compact firepower.[citation needed] It has a maximum effective range of about 500 to 600 meters (550–660 yd).[6] The fully automatic trigger gives a more consistent trigger pull, which leads to better accuracy.[32] According to Mark A. Westrom, owner of ArmaLite, Inc., automatic fire is better for clearing rooms than burst fire.[33]
In the last few years, M4A1 carbines have been refit or received straight from factory with barrels with a thicker profile under the handguard. This is for a variety of reasons such as heat dissipation during full-auto, and accuracy as a byproduct of barrel weight. These heavier barrel weapons are also fitted with a heavier buffer known as the H2. Out of three sliding weights inside the buffer, the H2 possesses two tungsten weights and one steel weight, versus the standard H buffer, which uses one tungsten weight and two steel weights. These weapons, known by Colt as the Model 921HB (for Heavy Barrel), have also been designated M4A1, and as far as the government is concerned the M4A1 represents both the 921 and 921HB.
Conversion of M4s to the M4A1 began in 2014, the start of all U.S. Army forces being equipped with the automatic variant.[34] Though in service with special forces, combat in Afghanistan showed the need for providing automatic suppression fires during fire and movement for regular soldiers. The 101st Airborne Division began fielding new-built M4A1s in 2012, and the U.S. 1st Infantry Division became the first unit to convert their M4s to M4A1-standard in May 2014. Upgrades included a heavier barrel to better dissipate heat from sustained automatic firing, which also helps the rifles use the M855A1 EPR that has higher proof pressures and puts more strain on barrels. The full-auto trigger group has a more consistent trigger pull, whereas the burst group's pull varies on where the fire control group is set, resulting in more predictable and better accuracy on semi-automatic fire. Another addition is an ambidextrous selector lever for easier use with left-handed shooters. The M4-M4A1 conversion only increases weapon weight from 7.46 lb (3.38 kg) to 7.74 lb (3.51 kg), counting a back-up iron sight, forward pistol grip, empty magazine, and sling. Each carbine upgrade costs $240 per rifle, for a total cost of $120 million for half a million conversions. 300 conversions can be done per day to equip a brigade combat team per week, with all M4A1 conversions to be completed by 2019
Mark 18 CQBR

The Mk 18 Close Quarters Battle Receiver is an M4A1 with a 10.3-inch barrel upper receiver.[37] Current contractors for the Mark 18 are Colt and Lewis Machine & Tool (LMT) NSN 1005-01-527-2288.
Enhanced M4

For the Individual Carbine competition, Colt submitted their Enhanced M4 design, also known as the Colt Advanced Piston Carbine (APC). The weapon has a suppression-ready fluted barrel, which is lighter and cools better than previous M4 barrels. It is claimed to have "markedly better" accuracy. To improve reliability, Colt used an articulating link piston (ALP) which "reduces the inherent stress in the piston stroke by allowing for deflection and thermal expansion".[38] In traditional gas piston operating systems, the force of the piston striking the bolt carrier can push the bolt carrier downwards and into the wall of the buffer tube, leading to accelerated wear and even chipped metal. This is known as carrier tilt. The ALP allows the operating rod to wiggle to correct for the downward pressure on the bolt and transfers the force straight backwards in line with the bore and buffer assembly, eliminating the carrier tilt. This relieves stress on parts and helps to increase accuracy.[39] The Individual Carbine competition was canceled before a winning weapon was chosen.
M4 Commando

Though Colt has focused its attention on carbines with 14.5-inch barrels and rifles with 20-inch barrels, Colt continues to make carbines with 11.5-inch barrels, which it calls Commandos. Originally, Commandos were assembled from whatever spare parts are available, so Model 733 Commandos could have A1-style upper receivers with case deflectors or A2-style upper receivers, and M16A1-profile 1:7 or M16A2-profile 1:7 barrels. Depending on the specific models, Commandos may have had three-position fire control groups (safe/semi-automatic/three-round burst), or four-position having both full-automatic and burst. The modern Model 933 has a "flattop" receiver, with a removable carrying handle and a MIL-STD-1913 Picatinny rail, with semi-automatic and automatic fire. The Model 935 Commando has the features of the Model 933, but has three-round burst fire instead of automatic. Though originally called the M16A2 Commando, Colt markets them as the M4 Commando.
Armwest LLC M4

In 2014, American firearms designer Jim Sullivan provided a video interview regarding his contributions to the M16/M4 family of rifles when working for Armalite. A noted critic of the M4 he illustrates the deficiencies found in the rifle in its current configuration. In the video, he demonstrates his "Arm West LLC modified M4", with enhancements he believes necessary to rectify the issues with the weapon. Proprietary issues aside the weapon is said to borrow features in his prior development, the Ultimax. Sullivan has stated (without exact 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. The weight of the cyclic components of the gun have been doubled (while retaining the weapons weight at less than 8 pounds). Compared to the standard M4 which in automatic fires 750-950 rounds a minute, the rate of fire of the Arm West M4 is heavily reduced both to save ammunition and reduce barrel wear, the reduced rate also renders the weapon more controllable and accurate in automatic firing
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