The AK-74 returns from ArmA: Armed Assault, and it is the standard issue rifle of the CDF, and available with a GP-25 grenade launcher. The AK-74 is used also by ChKDZ rebels, NAPA insurgents, and by Takistani militia in the Operation Arrowhead expansion.
The AKS-74 is used by squad leaders of the CDF, ChKDZ and NAPA factions. It is available either with a Kobra red dot sight or a PSO-1 scope. The Operation Arrowhead expansion introduces two new variants, one with a Soviet NSPU night vision optic and another with the GOSHAWK thermal weapon sight.
The AKS-74U is used by tank crew and pilots of the CDF, ChKDZ, NAPA and Russian factions. A suppressed version is also available, and used mainly by Spetsnaz operatives (AKS-74UN variant).
The AK-107 is the standard issue rifle of the Russian Army and MVD forces, although in real life they continue to use the AK-74M. The weapon is available in four versions, either with Kobra sight or PSO-1 scope and a GP-30 grenade launcher.
The AKM is used by ChKDZ insurgents and NAPA guerrillas. In the Operation Arrowhead' expansion, the AKM is used by Takistani militiamen.
The AKMS is also commonly seen used by CDF soldiers, ChKDZ insurgents and NAPA guerrillas. A special gold version of the rifle (similar to the special AK-47 in Call of Duty 4: Modern Warfare) is also programmed to occasionally appear in the hands of insurgents as an Easter egg. The AKMS is also seen sued by the Takistani militia in the Operation Arrowhead expansion.
The M4A1 Carbines are used by vehicle crews of the United States Marine Corps faction, as well as by most of the Force Recon operators. It is also used by the PMC operators and by some U.S. Army soldiers. The M4A1 has the most variations of any of the weapons in the game. Attachments included in those versions are iron sights, Aimpoint M68 CCOs, Trijicon TA01 and TANSN 4x32 ACOG scopes, EOTech 551 Holographic sights, M203 and M203A1 grenade launchers, KAC QDSS-NT4 suppressors, AN/PEQ-2 and AN/PEQ-15 IR designators, and KAC RIS foregrips. Also, the M4A1 erroneously features an M16A1 pistol grip for some reason.
The M16A2 is one of the available and playable weapons in the game, though it is not normally used by any of the factions. A version with the M203 grenade launcher is also available, and is used by Takistani soldiers and militants in the Operation Arrowhead expansion.
The M16A4 is the standard issue weapon of the United States Marine Corps faction, and is available in four variations, either fitted with carrying handle, Aimpoint M68 CCO, Trijicon TA01 4x32 ACOG scope or M203 grenade launcher with its leaf sight, though all of them have the AN/PEQ-2 IR designator.
The FN SCAR-L is the new standard issue weapon of the U.S Army faction in the Operation Arrowhead' expansion. The SCAR-L is available either with: Flip-up iron sights, Aimpoint M68 CCO, EOTech 551 painted in tan, Trijicon TA31RMR 4x32 ACOG scope, an unknown scope, unknown thermal scope and FN EGLM grenade launcher. Some of them also fitted with AN/PEQ-15 IR designator painted in tan and with RIS foregrip.
The Heckler & Koch G36 rifle is not used by any of the game's factions (with the exception of the G36C that is used by a CDhKZ faction leader), but is available in the mission editor for single or multiplayer scenarios. Three versions are available: the G36A with ZF 3x4¡ã dual optical sights, the G36K and the two versions of the G36C, including one with a suppressor and an EOTech sight. In the Operation Arrowhead expansion, German KSK soldiers utilize camouflaged versions of the G36A, G36K and G36C as their standard weapons.
The Heckler & Koch XM8 is one of the available assault rifles in-game, and was originally intended to be used in ArmA: Combat Operations, but later was cut-out of developing and ported to ArmA II. The whole XM8 family is included in the game, and ION Mercenaries of the Private Military Contractor DLC are using the XM8 as their standard issue weapon.
The L85A2 rifle is the standard weapon of the new British faction in the British Armed Forces DLC. The SA80A2 model featured is similar to the current RIS-equipped models used by soldiers in Afghanistan, and is available with SUSAT, ACOG (albeit with the standard ACOG rail mount rather than the correct TA61 mount unique to the SA80 series) and EOTech sights, as well as the L17A2 grenade launcher.
The SA Vz.58 was introduced in the Operation Arrowhead expansion, included in two variations: The Vz.58P, and the Vz.58V used by the Czech Army soldiers. There are two variations of the Vz.58V available, one with iron sights and the second with Trijicon TA01NSN ACOG, though both has a RIS foregrip and painted in desert camouflage.
The paratrooper 18" version of the FN FAL is the standard issue weapon of the Takistani Army soldiers in Operation Arrowhead expansion. Two variants of the FN FAL are available: regular and one with the AN/PVS-4 night-vision scope.
Lee-Enfield No.4 Mk.I rifles are used by Takistani militiamen in the Operation Arrowhead expansion.
The M14 is a weapon introduced in the Operation Arrowhead expansion. There are two version available: One with Aimpoint M68 CCO and one with Trijicon 4x32 ACOG scope. The M14 is one of the standard weapons used by Delta Force Sergeant Terry Graves during the Operation Arrowhead campaign.
Most U.S Army Delta Force soldiers in Operation Arrowhead use the FN SCAR-H rifle, which like the SCAR-L is available with various modifications.