Named "9x19mm Sidearm" in game.As the starting weapon of the terrroists faction.
Heckler & Koch USP45 Tactical
Named "KM .45 Tactical Pistol" in game, comes with a detachable silencer.As the starting pistol for the counter-terrroists faction.
SIG-Sauer P228
Named ".228 Compact" in game.Fires .357 SIG rounds.
IMI Desert Eagle Mark XIX
Named "Nighthawk .50 C" in game.Appear as the most powerful sidearm in the game.
FN Five-seveN
Named "ES Five-Seven" in game.It's available for the counter-terrorists only.Although its weak,but it has the strongest penetration power than any other pistols and also high capacity.
Beretta 92G Elite II
Named ".40 Dual Elite" in game. probably a homage to John Woo or Chow Yun Fat.The dual pistols are purchasable by the terrorists.It has the highest capacity in the pistol class,although it does very low damage per shot.
Colt Anaconda
Named simply as "Anaconda" in game and feed with 7 rounds.It fires .50 AE rounds.Appear as the only revolver in the game and a high-caliber pistol which can equal with the Desert Eagle.
SVI Infinity
the Infiniti(s) comes with a few color variants and three akimbo configurations.Appear as the most diverse weapon and the most accurate pistol in the game.
Luger P08
named "Luger" in game,it also comes with gold and silver finish.It is weak,low capacity and not very accurate.It's the one of two WW2 classic weapon in the game.
AMT Automag V
Named "AutomagV" in game.Currently appear as a skin for the Desert Eagle. Still available only in Korean version of CSO.
Shotguns
Benelli M3
Named "Leone 12 Gauge Super" in game.As the most cheapest shotgun in the game and suitable for close-quarter battle.
Benelli M4 Super 90
Named "Leone YG1264 Auto Shotgun" in game.It does lower damage but has the highest rate of fire than any other shotguns.
USAS 12
A fully automatic shotgun with a 20-round drum magazine which available for the terrroists only.It's very powerful in close range but it's unstable.
Winchester Model 1887
Named "Winchester" in game.It is very effective for hunting zombies and has high stopping power.
Sawed-off Double Barreled Shotgun
An unknown model of sawed-off double barrel shotgun.It does high damage even in middle-range although it has the lowest capacity.It's also the weapon which has the highest stopping power in the game.
Kel-Tec KSG
The Kel-Tec KSG 12 gauge is fed with 15 rounds in game.
Submachine Guns
Steyr TMP
Named "Schmidt Machine Pistol" in game. Comes with an integrated suppressor.As the low cost sub-machine gun for the counter-terrroists.
Ingram Mac-10
Unlike most of other guns, the MAC-10 retains its name because the company holding the rights to the name went bankrupt.It's the same level as the TMP,as the low cost sub-machine gun for the terrorists faction.
Heckler & Koch MP5A5
Named "KM Submachine Gun" in game.Appear as the most flexibility sub-machine gun in the game.
Heckler & Koch UMP
Named "KM UMP45" in game.Appearing to filled the lack of firepower of the MP5.
FN P90
Named "ES C90" in game,comes with a Lapin variation.It has high penetration power and also high capacity but it does low damage and expensive.
Heckler & Koch MP7A1
The MP7A1 in game can switch between "pistol mode" and "SMG mode".Appear as the most compact SMG in the game.
SA Vz.61 Skorpion
The SA Vz.61 Skorpion appears heavily modified in game and renamed into "Blue Lightning" and "Lazy Lightning". Both of them can switch between "SMG mode" and "rifle mode".The Blue Lightning was belong to the Counter-terrorists faction,and the Lazy Lightning was belong to the terrorist faction.These weapons are both belong to the rifles category.
Daewoo K1A
A Korean Carbine classified as SMG in game which available for the counter-terrorists faction only.It has similar firepower and high rate of fire which equal the assault rifles.It can also effect at long range.
M1928 Thompson
Named "Thompson Chicago" in game.Also comes with a gold plated variant.It's powerful and has high capacity,also has lower price than many SMGs.It's also the one of two WW2 classic weapon in the game.
TDI Vector
Named "Kriss Super V" in game, comes with a detachable suppressor and a akimbo configuration.It's firepower is equal to the UMP45 and the Thompson.Although it's cheaper,low recoil and accurate.
Assault Rifles
AK-47
Named "CV-47" in game. Comes with a few variations.As the most reliable rifle for the terrorists faction.It's powerful and cheap,but unaccurate when fully-automatic.
IMI Galil ARM
Named "IDF Defender" in game. Has the stats of the 5.56x45mm variant.This weapon is available for the terrorists faction only.As the cheapest rifle in the game.This rifle is very effect in close range and middle range.
FAMAS
Renamed as "Clarion 5.56" in game,as the cheapest rifle for the counter-terrorists faction.It's able to fire in 3 round brust,low recoil and also high rate of fire when fully-automatic.
SIG SG552 Commando
Named "Krieg 552" in game and available for the terrorists faction only.Appear as the assault rifle which has the highest rate of fire.This weapon is effect in close range and middle range.
Steyr AUG
Renamed "Bullpup" in game.Available for the counter-terrorists faction.Appear as a assault rifle which equal the SG552.It has high rate of fire and good accuracy.Effect in middle range to long range.
Colt M4A1 Carbine
Named "Maverick M4A1 Carbine" in game, comes with a few variation and all of them features a detachable suppressor.As the most reliable rifle for the counter-terrorists.This rifle is accurate,powerful and inexpensive,effect in any ranges.
Heckler & Koch XM8
The XM8 in game can be convert freely between the carbine variant and the sharpshooter variant,as the new generation rifle for the terrorists faction.It has high rate of fire and light weight,although it's not accurate.
FN SCAR
The FN SCAR in game can be convert freely between the SCAR-L and the SCAR-H.It's available for the counter-terrorists,as a new rifle for the counter-terrorists.
Mk 14 Mod 0 EBR
Named "M14 EBR" in game.Appear as the most powerful assault rifle in the game.Comes with a sniper rifle variation which called "Skull 5".
FN F2000
Named simply as "F2000 in game.
IMI Tavor TAR-21
Named simply as "TAR-21" in game.Comes with a EO-Tech telescope.
M16A4
The M16A4 retains it's name in game.Painted with desert camo and installed a forearm.It is only available for the counter-terrorists faction.The weapon is only be able to fire in 3 round burst.
AN-94
The AN-94 retains it's name in game.It is only available for the terrorists faction.The weapon's only be able to fire in 2 round burst.
HK 416
The HK 416 retains it's name in game.Currently appear as a skin for the M4A1. Still available only in Korean version of CSO.
AKM
The modernized AKM retains it's name in game. Currently appear as a skin for the AK-47. Still available only in Korean version of CSO.
Enfield L85A2
Named "L85A2" in game.Currently appear as a skin for the FAMAS. Still available only in Korean version of CSO.
FN FNC
Currently appear as a skin for the Galil. Still available only in Korean version of CSO.
Fictional Guns
Lightning SMG-1
The Lightning SMG-1 appears as a water gun.
Lightning Big Eye
The Lightning Big Eye appears as a water pistol, fires in 5-round burst only.
Lightning AR-1
The Lightning AR-1 is a fictional weapon appears to be a fusion of a bass guitar and an AK-pattern rifle,it feed with 30 round 5.56 NATO rounds.
SVD + M203 Grenade launcher
The SVD is named "SVDEX" and only available for VIP player in the zombie game mode. It has feature a Barrett style muzzle brake, and a sawn-off M203 and an EOTech Holograhic sight.
Gatling (Volcano)
The "Volcano" in game is fed with 40 round buckshots,and fires like a gatling gun.
Science Fiction Gun (Lightning Blaster)
The Lightning Blaster comes with 45 round mag and fires laser like 5.56mm bullets in game.
Quad Barrel
The Quad Barrel is a shotgun with four barrels,it's based on the double-barreled shotgun.The weapon is only usable by the female hero in Zombie Mode 3 only.
Salamander
The Salamander is a flamethrower which will burn out everything.It is fed with a bottled-gas.
Machine Guns
M249 PARA SAW
The SAW retains its name in game.
QBB-95/QBZ-95
The QBB95 appears under its real name and quipped with a 75 round drum magazine.
MG3
The MG3 retains its name in game.Comes with 200 round ammunition box.
GE M134 Minigun
Named simply as "M134" in game.Comes with 200 round belt.
Heckler & Koch HK23E
Named simply as "HK23" in game.Comes with 100 round ammunition box.
M60E4
The M60E4 retains it's name in game.Comes with 100 round ammunition box.
Hecker & Koch MG36
The MG36 retain it's name in game.As the most flexibility machine gun in the game.Comes with 100 round C-MAG drums.
Sniper Rifles
Steyr Scout
Renamed to "Schmidt Scout" in game.
Heckler & Koch G3SG/1
Named "D3/AU-1" in game.Available for the terrorists faction.
SIG SG550 Sniper
Named "KRIEG 550 commando" in game.Available for the counter-terrorists faction.
VSK-94
The VSK94 retain it's name in game, Comes with an integrated suppressor,as the new automatic sniper rifle for the counter-terrorists faction.
SVD Dragunov
Named simply "SVD" in game.As the new semi-automatic sniper rifle for the terrorists faction.
Accuracy International Arctic Warfare Magnum(AWM)
Named "Magnum Sniper Rifle(AWP)" in game, with a few variations.
Sako TRG
Named "TRG42" in game.Feed with 10 round mag.
Heckler & Koch SL-8
Named simply "SL8" in game.Comes with 20 round mag and 25 round for the gold-plated version and high capa variant.
M24 Sniper Rifle
Named simply as "M24" in game, painted with urban camo.Comes with 10 round mag.
Cheyenne Tactical M-200 Intervention
Named as "M200" in game.Looks like a M100.Feed with 10 round mag.
This screenshot shows .338 laupa instead of .408 cheytac, probably due to game developer or sprite artist's lack of effort
WA 2000
The WA2000 retains its name in game and feed with 12 rounds.It also comes with a gold-plated variation which fed with 15 rounds.
Barrett M95
The M95 retains its long name in game as "Barrett M95".
XM2010 ESR
The XM2010 appears as the one of the most powerful sniper rifle in the game and fed with 5 rounds.
Accuracy International AS50
The AS-50 is a anti-material sniper rifle which can fire in semi-automatic and feed with 5 rounds magazine.
Blaser R93 Tactical
Named simply as "R93" in game.Currently appear as a skin for the AWM. Still available only in Korean version of CSO.
Accuracy International AW50F
Named "AW50" in game.Currently appear as a skin for the AWM. Still available only in Korean version of CSO.
Others
Crossbow
The crossbow appear as the only "missile weapon" in the game.It fed with 50 rounds arrows.
Grenades
M67 Hand Grenade
Named "Fragmentation grenade" in game as the primary weapon for the player in the "Grenade Warfare" mode, it also has a flame grenade variant which available in the zombie modes.
Model 24 Stielhandgranade
Named simply as "M24 Grenade" in game.
Launchers
M79 grenade launcher (Sawn-Off)
Named "M79 Saw-Off" in game.
M203 Grenade Launcher (Sawn-Off)
Appear as a part of the "SVDEX".
M136 AT4
Named "AT Lance" in game. Available only in the "Human Scenario" and "Metal Arena" modes.
Land Mines
The M14 landmine appears in the zombie union mode.
Unknown Gatling Guns
The RAH-66 Comanche,V-22 Osprey and UCAV in game are equiped with 30mm Gatling guns.