ArmA III, like any previous part of the series, offers a wide range of weapons – from pistols and assault rifles to rocket launchers. Each of these weapons has different ballistics, i.e. properties such as recoil, rate of fire, or mode of fire. In this section, you will find information about several types of weapons that you will find in the game.
Assault Rifles – Example: MX 6.5mm (30 rounds per magazine), Katiba Grease 6.5mm (30 rounds per magazine). Both rifles have two firing modes – automatic and single fire. Automatically causes more kickback, especially if you hold down the button. In single player mode, as the name suggests, it’s best to take single shots, thus having less dispersion and better accuracy.
Katiba 6.5 mm
MX 6.5mm
Anti-tank – Example: PCML or RPG-42 are used, as the name suggests, against armored vehicles. The number of missiles needed to destroy a vehicle depends on the vehicle itself. As for civilian vehicles or conventional military jeeps, one missile is usually sufficient. It’s not so easy with armored vehicles. You can also use homing missiles which are much easier to use.
RPG-42 Alamut
PCML
Sniper Rifles – Example: M320 LRR .408 or GM6 Lynx 12.7mm. Sniper rifles are obviously high caliber, so one shot at an enemy is usually enough. This type of weapon has a lot of recoil when fired, so it’s best to choose a good position, such as prone. If you are a sniper, it is recommended to stay away from the battlefield because you won’t have much advantage in close combat.
GM6 Lynx 12.7mm
M320 LRR .408
Sidearm – Example: PO7 9mm or Rook-40 9mm. Ammo is usually used when we run out of ammo for an assault rifle. Weapon damage is low and requires at least four to five hits to kill an opponent (unless you headshot them). The recoil is low, so single shots and good accuracy can save you from a tough situation.
PO7 9 mm
Rook-40 9mm
Weapon add-ons
Each weapon can be modified, but our options are somewhat limited. We can add a silencer, a laser sight, a sight or several types of clips.
In the Showcase missions available in the beta, you won’t have many options to change your weapons. However, some multiplayer servers offer a box filled with mods and various weapons. Adding attachments to your weapon is not a difficult process – just click on the part you want to attach, hold down the left mouse button and drag it to a slot on your weapon.
Source: https://guides.gamepressure.com