The M4 carbine is a 5.56×45mm NATO assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle.
The M203 is a single-shot 40 mm under-barrel grenade launcher designed to attach to a rifle. It uses the same rounds as the older stand-alone M79 break-action grenade launcher, which utilizes the high-low propulsion system to keep recoil forces low. While compatible with many weapons, the M203 was originally designed and produced by the United States military for the M16 rifle and its carbine variant, the M4. The launcher can also be mounted onto a C7, a Canadian version of the M16 rifle; this requires the prior removal of the bottom handguard.
The La France M16K is an M16 rifle modified by the company La France Specialties, which among with other firearm-related activities, convert common military weapons into more compact configurations typically for law enforcement and special forces use.
The United States Navy Mk 12 MOD 0/1/H Special Purpose Rifle (SPR) is a designated marksman rifle that was in service with United States Special Operations Forces in the designated marksman role until 2017, also designed to be shorter than standard weapons. SPR initially stood for Special Purpose Receiver as it referred to an add-on upper receiver assembly, but that nomenclature changed to Special Purpose Rifle as the weapon became a stand-alone weapons system.
The 1913 rail, also known as the Picatinny rail is an American rail integration system designed by Richard Swan that provides a mounting platform for firearm accessories. It forms part of the NATO standard STANAG 2324 rail. It was originally used for mounting of scopes atop the receivers of larger caliber rifles.
The SEAL Recon Rifle is an American designated marksman rifle and assault rifle used by the United States Navy SEALs. Essentially a heavily modified M16 rifle, it is intended to provide SEAL snipers and designated marksmen with a versatile, accurate, lightweight, and relatively compact weapon chambered in 5.56×45mm NATO.
The Squad Advanced Marksman Rifle (SAM-R) is a semi-automatic designated marksman rifle developed and used by the United States Marine Corps. It gave users the capability to provide fire in support of a rifle squad, providing precision fire in support of an assault, and aid in observation and adjusting of supporting arms.
The Close Quarter Battle Receiver (CQBR) is a replacement upper receiver for the M4A1 carbine developed by the US Navy.
The Mk 14 Enhanced Battle Rifle (EBR) is an American military selective fire battle rifle, and a designated marksman rifle chambered for the 7.62×51mm NATO cartridge. It is a variant of the M14 battle rifle and was originally built for use with units of United States Special Operations Command, such as the United States Navy SEALs, Delta Force, and task specific Green Berets ODA teams/units.
A designated marksman rifle (DMR) is a modern scoped high-precision rifle used by infantry in the designated marksman (DM) role. It generally fills the engagement range gap between a service rifle and a dedicated sniper rifle, at around 300–600 metres (330–660 yd).
The SR-25 is a designated marksman rifle and semi-automatic sniper rifle designed by Eugene Stoner and manufactured by Knight's Armament Company.
The M110 Semi Automatic Sniper System is an American semi-automatic sniper rifle that is chambered for the 7.62×51mm NATO round. It is manufactured by Knight's Armament Company, developed from the Knight's Armament Company SR-25, and adopted by the U.S. military following the 2005 US Army Semi-Automatic Sniper Rifle competition.
The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM. The kit allows US Special Operations Forces personnel to configure their weapons to individual preferences and customize for different mission requirements.
The Bushmaster M4 or M4A3 is a semi-automatic or select-fire assault carbine manufactured by Bushmaster Firearms International, modeled on the AR-15. It is one of the Bushmaster XM15 line of rifles and carbines.
The M6 is a series of carbines designed and manufactured by LWRC International. It is based on the M4 carbine, with which it shares 80% of its parts. The 'M' model name is not a US military designation. Like the HK416, it features a proprietary short-stroke self-regulating gas piston system and bolt carrier/carrier key design, which prevents trapped gases from contacting the bolt carrier or receiver of the weapon. The manufacturer claims that this reduces the heating and carbon fouling of the internals, simplifies field maintenance, and improves reliability.
A STANAG magazine or NATO magazine is a type of detachable firearm magazine proposed by NATO in October 1980. Shortly after NATO's acceptance of the 5.56×45mm NATO rifle cartridge, Draft Standardization Agreement (STANAG) 4179 was proposed in order to allow NATO members to easily share rifle ammunition and magazines down to the individual soldier level. The U.S. M16 rifle's magazine proportions were proposed for standardization. Many NATO members, but not all, subsequently developed or purchased rifles with the ability to accept this type of magazine. However, the standard was never ratified and remains a "Draft STANAG".
Lewis Machine & Tool Company (LMT) is an American armaments company founded by Karl Lewis, in 1980. It manufactures weapon systems, including a variant of the M4 carbine and the M203 grenade launcher. Its products are used by the military forces of the United Kingdom, New Zealand, Estonia and the United States. It formerly produced forged FN FAL receivers for Illinois-based DS Arms.
M110A1 may refer to the M110A1 CSASS or the M110A1 SDMR. It is an American semi-automatic sniper rifle that is chambered for the 7.62×51mm NATO round. It is manufactured by Heckler & Koch (H&K) and developed from the company's HK417, and similar to the Bundeswehr G28 configuration. Despite a designation similar to the M110 Semi-Automatic Sniper System, the M110A1 is an unrelated design as the former was a development of the Knight's Armament Company SR-25. The M110A1 CSASS was expected to supplant and eventually replace the M110 in U.S. military service but this does not appear to have occurred as of 2022. However, several thousand M110A1 SDMRs have been fielded with the US Army and Air Force to replace various weapon systems currently being used.
The KS Carbine, is a series of rifles produced by Knight's Armament Company (KAC). It is designed as an improved version of their Armalite AR-15 clone called SR-16. The 13.7" KS-1 variant was adopted as the L403A1-AIW by the British Armed Forces in 2023 to replace the L85A2-A3 and L119A1-A2 rifles used by British Army and Royal Marines special operations-capable forces.
