What Is An M4 #129

What Is An M4

The M4 carbine is a 5.56mm, magazine-fed carbine that is developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle.

The M4 was extensively used by the United States Armed Forces, starting in 2009, with decisions to largely replace the M16 rifle in US Army combat units and the Marine Corps as the primary infantry weapon and service rifle.

The M4 is adopted by more than 60 countries around the world and is described as one of the defining firearms of the 21st century.

In 1995, the M4 underwent extensive modification, including the M4A1 variant, which strengthened the barrel and removed the burst-fire option, as well as an accessory kit containing optical attachments.

Content

• What Is An M4
• M4 History
• Improved M4
• Design M4
• Reliability
• Accuracy
• Tippmann Tactical Airsoft BT M4 AEG Rifle CA Black Specs

M4 History

The U.S. government asked Colt to make a carbine version of the M16A2 rifle. At the time, the Colt M16A2 was the Colt 645, also known as the M16A1E1.

In January 2016, the U.S. Army Armament Munitions Chemical Command helped Colt develop a new variant of the XM177E2, and the U.S. Army officials renamed the XM177E2, known as the M4, in order to give it a more appropriate name.

The carbine uses the same upper receiver and bolt carrier group as the M16A1, and fires the M855 cartridge along with the older M193 cartridges. The XM4 has been tested by the Army’s Armament Research and Development Center in June 1983.

After the gun was updated, the barrel had an improved furniture and a twist rate of one turn in seven inches (180mm).

In the summer of 2015, major Marine commands were endorsing switching to the M4 over the M16A4 as the standard infantry rifle. That’s just as the Army had done.

Because of the carbine’s light weight, compact length, and ability to engage modern combat situations in close quarters; if a squad needs to engage at longer ranges, the M27 IAR is used as a designated marksman rifle.

The plan for the army would have the M16 rifle support people who carried the weapons and ammunition they needed into battle. In contrast, armories already had the 17,000 M4 rifles available to outfit all infantrymen who needed them.

The U.S. Marine Corps officially adopted the M4 carbine as its standard issue service rifle for all of its infantry, special operations and security forces.

The switch was completed by September 2016. In December 2017, the Marine Corps announced plans to equip every Marine in an infantry squad with the M27, replacing the M4 in that part of the service.

The M4 has been replaced with the Modular Weapon System, which includes a number of different configurations to allow the operator to select the most appropriate weapon system for the situation.

Improved M4

In 2009, the U.S. Army took total ownership of the M4 design. The Army’s decision to allow the Colt.45 to be used by the civilian market meant that competitors could start manufacturing their own version of the M4 rifle.

The U.S. Army planned on fielding the last of its M4 requirement in 2010. In October 2009, Army weapons officials proposed a series of changes to the M4. They wanted to make the weapon easier to carry and more ergonomic.

The author requested an electronic round counter, a heavier barrel, and possible replacement of the Stoner expanding gas system with a gas piston system. There is some evidence, however, that many of these changes will benefit society.

According to a PDF detailing the M4 carbine improvement plans released by PEO Soldier, the direct impingement system would be replaced after the U.S. Army conducted comparisons between the direct impingement system and commercial gas piston operating systems to determine which is the best available operating system for the M4 carbine.

The Army’s M4A1 carbine has improved many times.

Design M4

The M4 and its variants fire 5.56×45mm NATO (and.223 Remington) ammunition, are gas operated, magazine fed, selective fire, and have either a multi position telescopic stock or a fixed, A2 or LE, tactical stock.

The first stock that was fitted to the M4 in 1985 was made entirely of plastic, which could only go in two directions. It couldn’t be fully opened or fully closed and there were only two positions it could occupy. They are commonly called the six-position stock, M4, or waffle-stock.

The M4 carbine is a shorter and lighter variant of the M16A2 rifle, with 80% parts commonality. The maneuverability of the M4 allows it to be used by many different types of troops, from vehicle crew and staff officers, to ground troops. In CQB situations, the weapon’s maneuverability is its greatest asset.

The M4, along with the M16A4, has replaced the M16A2 in the Army and Marines.

In addition to the transition of M16s to the new M4 for Security Forces, the US Air Force is also transitioning its Security Forces personnel to the new M4 for Security Forces rifles. While other armed personnel remain with the M16A2 weapons.

A M4A1 is used by the United States Navy for special operations and vehicle crews. While it is the best choice for a short-range defensive weapon, the M4’s shorter barrel reduces its range. Its rear iron sights are integrated into the carry handle, and only adjustable from 300 m (328 yd) up to 600 m (656 yd).

Reliability

Early in 2010, two journalists from the New York Times visited the United States Armed Forces in Afghanistan. For three months they were there to follow their stories. They also spoke to 100 men from the infantry, who had been issued the M4 and the M16.

Soldiers did not report reliability problems with their rifles. While only 100 troops were asked, they fought a dozen intense engagements in Helmand Province, where the ground is covered in fine powdered sand (called “moon dust” by troops) that can stick to their weapons.

Dirty, wet, and covered in mud weapons were often used by the soldiers of the time. Intense firefights lasted hours with multiple magazines being expended. Only one soldier said he had problems with his M16 when it got wet.

The gun was cleared and fired the next chambered round. Furthermore, a Marine captain reported that there were no issues with his battalion’s 700 M4s and 350 M16s.

It has been reliably upgraded over time. In 1990, the M4 was required to fire 600 mean rounds between stoppages using M855 ammunition. 

In 2013, the M4A1 version can fire an average of 1,691 rounds between stoppages using M855A1 ammunition. The Colt IAR had a total of 8,054 stoppages of 952 rounds, with a MRBEFF of Class III Stoppages of 60,000 rounds.

Accuracy

Using the M16, you can hit targets at over 270 meters; using match grade ammo, you’ll be able to achieve groups at over a thousand meters.

Author Chris McNab concluded that this meant the M4 could be consistently accurate up to 300 yards and noted that the frequent usage of optical attachments meant it could be accurate to higher ranges.

Tippmann Tactical Airsoft BT M4 AEG Rifle CA Black Specs

Max Velocity	400 fps
Overall Length	31.0″
Buttplate	Rubber
Function	Repeater
Scopeable	Weaver mounts
Safety	Manual
Caliber	6mm
Barrel Length	10.5″
Shot Capacity	300
Barrel	Smooth bore
Front Sight	Adjustable for windage
Rear Sight	Adjustable for windage
Trigger	Single-stage
Action	Semiautomatic/Full-auto
Powerplant	AEG
Trigger Action	Single-Action
Hop Up	Adjustable
Material	Synthetic
Gearbox	ABS Plastic
Shrouded	No

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