Assault

The M82 Assault Rifle is the standard issue ISA assault rifle manufactured by ISA Weapon Systems, and may even be in service with the UCA. It saw the most action during the Second Extrasolar War. It was commonly used by ISA RRF and Marines during the Helghast assault on Vekta and the ISA invasion of Helghan. Its equivalent is the Helghast StA52 Assault Rifle. Strangely, the version of the M82 in Killzone 1 had an underslung grenade launcher for a heavier punch, but the latest version in Killzone 2 appears to lack one. Another notice is that the launcher is replaced with a flashlight that somehow cannot be used. This is possibly due to the Killzone variant being in the use of RRF soldiers.

The primary weapon of the Helghast armies is the StA52 Assault Rifle or LAR manufactured by Stahl Arms. The StA52 seems to be more of a modular weapons system than a single weapon, since almost all of the Helghast weapons use a similar drum-style magazine design. It has a bullpup design with a drum-mag behind the handguard. It has iron-sights in Killzone 2, and is used by low ranked Helghast forces. The rifle seems to use a gas operated mechanism with a secondary tube running on top of the barrel for exhaust pumping much like a modern day rifle such as the AK or M-16. It fires more rapidly than the M82 Assault Rifle, but the iron-sights and poor range limit its usefulness at longer ranges; however, it is quite useful at short to mid-range

Battle

The StA14 Rifle has been used by Helghast Riflemen for over 50 years, is considered to be an honor to carry this classic weapon into battle, and is manufactured by Stahl Arms. It fires high-speed, armor-piercing rounds and is very accurate, useful for picking off distant enemies (especially Helghast manning emplacements in the Campaign). Exceptions are the fact that there is no internal magazine and en bloc clip, it has a bullpup design and a cylinder magazine (there seems to be a cylindrical magazine in all Helghast weapons).

Sniper

The StA52 Sniper/Light Assault Rifle is manufactured by Stahl Arms and is the only sniper rifle fielded during the invasion of Vekta.

The VC32 Sniper Rifle is a Helghast weapon, only found on Helghast soldiers and is manufactured by Visari Corporation. It is a precision rifle equipped with an illuminated x2 and x5 sniper scope and an extended barrel for increased bullet speed and precision; it fires armor and helmet-piercing rounds. The VC32 is a most accurate and deadly weapon, especially over long distances. However, despite being extremely lethal when fired at upper torso or head, the rifle is hampered by its slow rate of fire, limited magazine capacity, and its extreme accuracy is only available when scoped.

Shotguns (all are MY personal Favorites)

The LS13 Shotgun (nicknamed "Lucky Strike") is an ISA weapon that fires a dense cloud of pellets with every shot and is manufactured by ISA. More often than not, they end up being carried by Helghast commandos and assault troopers (who more than likely took them from dead ISA soldiers or had them shipped back by the mercenaries in KZL). In Killzone 2, Natko carries one.The LS13 is one of the most efficient weapons in the game, allowing for multiple kills before requiring a reload. It is extremely lethal at close range, but is also useful at medium range. It is ineffective at long range, leaving the unwary shotgunner exposed to long range weapons.The weapon is capable of immobilizing almost any opponent, but long reload times will leave its operator vulnerable if chambered ammo is not monitored and the time it takes to breach a new round every time it's fired also makes the player an easy target. Reloads should be performed from a position of safety outside of combat.In the campaign, it is usually wielded by armored Assault Helghast, making them one of the most dangerous enemies in the game.The Shotgun fires a burst of 20 pellets. If all pellets strike the enemy target, it often results in instant death. In close quarters combat, it is a truly deadly weapon. The 20-pellet burst also allows an interesting statistic of accuracy above 100% in multiplayer.

The VC8 Shotgun Pistol is a three-barreled secondary weapon developed by the Helghast and is manufactured by Visari Corporation, holding one shell in each barrel. Great for close combat, it lacks in lethality at extended ranges.