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The Colt's Manufacturing Company Advanced Colt Carbine-Monolithic is an improved version of the M4 carbine presented to the United States military at a conference as a possible replacement for the M16 rifle and M4 carbine within the military.
The Colt ACC-M (Advanced Colt Carbine-Monolithic) adds Colt's proprietary, monolithic Mil-Std-1913 rail system (quad rail) forward hand guard to the normal M4 carbine upper receiver.
Colt M4 Carbines and Colt M4A1 Carbines can be easily and relatively inexpensively modified/upgraded into ACC-Ms by replacing the upper receiver, which is more cost-effective than completely replacing the weapons with a whole new carbine with a different control layout and different overall ergonomics and handling characteristics that require new and different training and maintenance protocols.
New-made ACC-Ms carry the model numbers "R0922" (S-1-3) and "R0923" (S-1-F). There is also a version of the R0923 with an 11.5" (Colt Commando) barrel known as the "R0923CQB."
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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 5.56mm automatic rifle with a 20-round magazine.
The Colt AR-15 is a lightweight, 5.56×45mm, magazine-fed, gas-operated semi-automatic rifle. The "AR” stands for Armalite Rifle. It was designed to be manufactured with extensive use of aluminum alloys and synthetic materials. Colt was but no longer is marketing to civilian customers and is presently only marketing to law-enforcement customers, due to oversaturation in the civilian market. Colt's Manufacturing Company currently uses the AR-15 trademark for its line of semi-automatic AR-15 rifles.
The M4 carbine is a shorter and lighter variant of the M16A2 assault rifle. The M4 is a 5.56×45mm NATO, air-cooled, gas-operated, magazine-fed carbine. It has a 14.5 in (370 mm) barrel and a telescoping stock.
The Colt Canada C7 is a Canadian assault rifle, manufactured by Colt Canada, having similar design and function to the Colt M16A3.
The United States Navy Mark 12 Mod 0/1 Special Purpose Rifle (SPR) is a semi-automatic designated marksman rifle in service with United States Special Operations Forces used in the designated marksman role, also designed to be shorter than standard weapons. SPR initially stood for Special Purpose Receiver, but that nomenclature has been replaced as the weapon became a stand-alone weapons system, and not just an add-on upper receiver assembly. The SPR was eventually type-classified by the U.S. Navy as the Mk 12. The weapon was developed by the Naval Surface Warfare Center Crane Division for US special operations units, not for Navy units in general.
The ArmaLite AR-15 is a select fire, air-cooled, gas-operated, magazine-fed rifle manufactured in the United States between 1959 and 1964. Its military version was adopted by the United States Armed Forces as the M16 rifle. The military version M-16 was a select fire, air-cooled, gas-operated, magazine-fed rifle. 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 selective fire, lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow the carry of more ammunition.
The Colt Automatic Rifle-15 or CAR-15 was a family of M16 rifle based firearms marketed by Colt in the 1960s and early 1970s. However, the term "CAR-15" is most commonly associated with the Colt Commando(AKA: XM177); these select-fire carbines have ultrashort 10.5-inch (270 mm) and 11.5-inch (290 mm) barrels with over-sized flash suppressors.
The Close Quarter Battle Receiver (CQBR) is a replacement upper receiver for the M4A1 Carbine, developed by the US Navy. The CQBR features a barrel 10.3 in (262 mm) in length, similar to the Colt Commando short-barreled M16 variants of the past. This shorter barrel makes the weapon significantly more compact, which makes it easier to use in and around vehicles and in tight confined spaces. Special units such as commandos boarding ships and bodyguards for senior officers have found such shortened weapons very useful and use the CQBR.
The United States Army Squad Designated Marksman Rifle (SDM-R) is a heavily modified M16-series rifle intended to provide increased accuracy at longer ranges, giving infantry squads greater firepower.
Colt Defense LLC, together with its subsidiaries, is an American designer, developer and manufacturer of small arms weapons systems for individual soldiers and law enforcement personnel. It is headquartered in West Hartford, Connecticut. The company traces its portfolio of products and services back to Colt's Manufacturing Company and prior to that to Colt's Patent Firearms Manufacturing Company. The company and its predecessors have supplied small arms weapons systems to the United States Government and other governments throughout the world since the Mexican–American War of 1847.
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 weapons, specifically the Colt M4 carbine family issued to the U.S. military, it uses a proprietary short-stroke gas piston system derived from the ArmaLite AR-18. 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.
Daewoo Precision Industries K2 assault rifle was developed by the South Korean Agency for Defense Development and manufactured by S&T Motiv. It is currently the standard service rifle of the Republic of Korea Armed Forces. Shoulder-fired and gas-operated, the K2 is capable of firing both 5.56×45mm NATO and .223 Remington ammunition. The K2 supplanted the M16A1 assault rifle for the Republic of Korea Armed Forces since its adoption in 1984.
The Marine Scout Sniper Rifle or MSSR is a semi-automatic sniper rifle developed from the Colt M16A1 rifle by the Philippine Marine Corps Scout Snipers due to the lack of a dedicated sniper rifle which is used in the Armed Forces of the Philippines.
The Barrett M468 is a variant of the M4 Carbine, rechambered for a heavier and larger 6.8mm bullet for increased terminal performance. The designation of M468 stands for an M4 carbine chambered for the 6.8mm SPC cartridge. It was an attempt to create an optimal Special Operations close-to-medium range carbine for Close Quarter Battle (CQB). A 12-inch barreled micro-carbine and 16-inch barreled carbine version were created. Barrett ceased manufacturing the rifle in 2010.
The Adaptive Combat Rifle (ACR) is a modular assault rifle designed by Magpul Industries of Austin, Texas, and known initially as the Masada.
Lewis Machine & Tool Company (LMT) is an American armaments company. It was founded by Karl Lewis in 1980. LMT started its business by providing US law enforcement and government agencies with military type weapons and accessories. Subsequently they expanded to supply military and commercial retailers. All of LMT's engineering and manufacturing is done at their facility in Milan, Illinois. LMT manufactures complete weapon systems such as the M4/AR-15 and the M203 grenade launcher. The militaries of the United Kingdom, New Zealand and the United States use LMT products.
The Colt CM901 is a modular selective-fire rifle. Its caliber and barrel length can be changed without the use of tools. Its semi-automatic variant is the LE901-16S.
The ADCOR A-556 is an assault rifle based on the M16/M4 series. It is produced by the Adcor Defense Company and was one of the contenders in the US Army Individual Carbine Competition to replace the M4 Carbine.