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Description
M16/A1
"The M16 rifle, officially designated Rifle, Caliber 5.56 mm, M16, is a family of military rifles adapted from the ArmaLite AR-15 rifle for the United States military . The original M16 rifle was a 5.56 mm automatic rifle with a 20-round magazine.
In 1964, the M16 entered US military service and the following year was deployed for jungle warfare operations during the Vietnam War .[1] In 1969, the M16A1 replaced the M14 rifle to become the US military's standard service rifle .[11] [12] The M16A1 improvements include a bolt-assist, chrome-plated bore and a 30-round magazine.[1]
In 1983, the US Marine Corps adopted the M16A2 rifle and the US Army adopted it in 1986. The M16A2 fires the improved 5.56×45 mm NATO (M855/SS109) cartridge and has a newer adjustable rear sight, case deflector, heavy barrel, improved handguard , pistol grip and buttstock , as well as a semi-auto and three-round burst fire selector.[13] [14] Adopted in July 1997, the M16A4 is the fourth generation of the M16 series. It is equipped with a removable carrying handle and Picatinny rail for mounting optics and other ancillary devices.[15]
The M16 has also been widely adopted by other armed forces around the world. Total worldwide production of M16s is approximately 8 million, making it the most-produced firearm of its 5.56 mm caliber.[16] The US military has largely replaced the M16 in frontline combat units with a shorter and lighter version, the M4 carbine .[17] [18] "
M4/A1
"The M4 Carbine is a 5.56×45mm NATO , air-cooled, gas-operated ,[b] direct impingement , magazine -fed, select fire carbine . It has a 14.5 in (370 mm) barrel and a telescoping stock . It is essentially a lighter and shorter variant of the M16A2 assault rifle .
The M4 is extensively used by the United States Armed Forces and is largely replacing the M16 rifle in United States Army and United States Marine Corps (USMC) combat units as the primary infantry weapon[6] [7] and service rifle . The M203 and M320 grenade launchers can be mounted on the lower hand guard of the carbine (see where bipod is attached on the photo). The distinctive step in its barrel is for mounting the M203 with the standard hardware. The M4 has semi-automatic and three-round burst firing modes (like the M16A2 and M16A4), while the M4A1 has semi-automatic and fully automatic firing modes (like the M16A1 and M16A3)."
AR-15
"The ArmaLite AR-15 is a select-fire , air-cooled, gas-operated, magazine-fed rifle manufactured in the United States between 1959 and 1964, and adopted by the United States Armed Forces as the M16 rifle .[5] Designed by American gun manufacturer ArmaLite in 1956, it was based on its AR-10 rifle. The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow infantrymen to carry more ammunition.
In 1959, ArmaLite sold its rights to the AR-15 to Colt due to financial difficulties and limitations in terms of manpower and production capacity.[6] After modifications (most notably, the charging handle was re-located from under the carrying handle like AR-10 to the rear of the receiver ),[7] Colt rebranded it the Colt 601, however it still carried the Armalite markings due to contractual obligations to Armalite/Fairchild Aircraft Co. Colt marketed the redesigned rifle to various military services around the world and it was subsequently adopted by the U.S. military as the M16 rifle , which went into production in March 1964.[5] [8]
Colt continued to use the AR-15 trademark for its line of semi-automatic-only rifles marketed to civilian and law-enforcement customers, known as Colt AR-15 . The Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants .
The Colt AR-15 is a lightweight, magazine-fed, gas-operated semi-automatic rifle . The "AR” stands for the first two letters of ArmaLite .[1] It was designed with the extensive use of aluminum alloys and synthetic materials in order to reduce weight. [2] [3] Colt's Manufacturing Company currently uses the AR-15 trademark for its line of semi-automatic AR-15 rifles ."
HK-416
"The Heckler & Koch HK416 is an assault rifle designed and manufactured by the German company Heckler & Koch . Although its design is based on the AR-15 class of firearm, specifically the Colt M4 carbine family issued to the U.S. military , it uses a proprietary short-stroke gas piston system from Heckler & Koch's earlier G36 family of rifles. It is the standard assault rifle of the Norwegian Armed Forces , selected by the French Armed Forces to replace the FAMAS , and was the weapon used by SEAL Team Six to kill Osama Bin Laden in 2011.[1] [2] "
-Wikipedia

Update: Made it much bigger, and cleared out more white spots!

Description
M16/A1
"The M16 rifle, officially designated Rifle, Caliber 5.56 mm, M16, is a family of military rifles adapted from the ArmaLite AR-15 rifle for the United States military . The original M16 rifle was a 5.56 mm automatic rifle with a 20-round magazine.
In 1964, the M16 entered US military service and the following year was deployed for jungle warfare operations during the Vietnam War .[1] In 1969, the M16A1 replaced the M14 rifle to become the US military's standard service rifle .[11] [12] The M16A1 improvements include a bolt-assist, chrome-plated bore and a 30-round magazine.[1]
In 1983, the US Marine Corps adopted the M16A2 rifle and the US Army adopted it in 1986. The M16A2 fires the improved 5.56×45 mm NATO (M855/SS109) cartridge and has a newer adjustable rear sight, case deflector, heavy barrel, improved handguard , pistol grip and buttstock , as well as a semi-auto and three-round burst fire selector.[13] [14] Adopted in July 1997, the M16A4 is the fourth generation of the M16 series. It is equipped with a removable carrying handle and Picatinny rail for mounting optics and other ancillary devices.[15]
The M16 has also been widely adopted by other armed forces around the world. Total worldwide production of M16s is approximately 8 million, making it the most-produced firearm of its 5.56 mm caliber.[16] The US military has largely replaced the M16 in frontline combat units with a shorter and lighter version, the M4 carbine .[17] [18] "
M4/A1
"The M4 Carbine is a 5.56×45mm NATO , air-cooled, gas-operated ,[b] direct impingement , magazine -fed, select fire carbine . It has a 14.5 in (370 mm) barrel and a telescoping stock . It is essentially a lighter and shorter variant of the M16A2 assault rifle .
The M4 is extensively used by the United States Armed Forces and is largely replacing the M16 rifle in United States Army and United States Marine Corps (USMC) combat units as the primary infantry weapon[6] [7] and service rifle . The M203 and M320 grenade launchers can be mounted on the lower hand guard of the carbine (see where bipod is attached on the photo). The distinctive step in its barrel is for mounting the M203 with the standard hardware. The M4 has semi-automatic and three-round burst firing modes (like the M16A2 and M16A4), while the M4A1 has semi-automatic and fully automatic firing modes (like the M16A1 and M16A3)."
AR-15
"The ArmaLite AR-15 is a select-fire , air-cooled, gas-operated, magazine-fed rifle manufactured in the United States between 1959 and 1964, and adopted by the United States Armed Forces as the M16 rifle .[5] Designed by American gun manufacturer ArmaLite in 1956, it was based on its AR-10 rifle. The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow infantrymen to carry more ammunition.
In 1959, ArmaLite sold its rights to the AR-15 to Colt due to financial difficulties and limitations in terms of manpower and production capacity.[6] After modifications (most notably, the charging handle was re-located from under the carrying handle like AR-10 to the rear of the receiver ),[7] Colt rebranded it the Colt 601, however it still carried the Armalite markings due to contractual obligations to Armalite/Fairchild Aircraft Co. Colt marketed the redesigned rifle to various military services around the world and it was subsequently adopted by the U.S. military as the M16 rifle , which went into production in March 1964.[5] [8]
Colt continued to use the AR-15 trademark for its line of semi-automatic-only rifles marketed to civilian and law-enforcement customers, known as Colt AR-15 . The Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants .
The Colt AR-15 is a lightweight, magazine-fed, gas-operated semi-automatic rifle . The "AR” stands for the first two letters of ArmaLite .[1] It was designed with the extensive use of aluminum alloys and synthetic materials in order to reduce weight. [2] [3] Colt's Manufacturing Company currently uses the AR-15 trademark for its line of semi-automatic AR-15 rifles ."
HK-416
"The Heckler & Koch HK416 is an assault rifle designed and manufactured by the German company Heckler & Koch . Although its design is based on the AR-15 class of firearm, specifically the Colt M4 carbine family issued to the U.S. military , it uses a proprietary short-stroke gas piston system from Heckler & Koch's earlier G36 family of rifles. It is the standard assault rifle of the Norwegian Armed Forces , selected by the French Armed Forces to replace the FAMAS , and was the weapon used by SEAL Team Six to kill Osama Bin Laden in 2011.[1] [2] "
-Wikipedia

Update: Made it much bigger, and cleared out more white spots!