Grab yourself a Sniper for long-range, Sub Machine Gun for close range, Assault rifle for a good balance, or a Light Machine Gun for max ammo.
All Primary Weapons cost 2000 Points after reaching the unlock level or purchase threshold. All weapons unlocked by default require 0 points.
Assault Rifles
M16
Unlocked: Default
Enfield
Unlocked: Level 5
M14
Unlocked: Level 9
Famas
Unlocked: Level 14
Galil
Unlocked: Level 20
AUG
Unlocked: Level 26
FN FAL
Unlocked: Level 32
AK47
Unlocked: Level 38
Commando
Unlocked: Level 44
G11
Unlocked: After buying all other Assault Rifles.
Submachine Guns
MP5K
Unlocked: Default
Skorpion
Unlocked: Level 7
Mac11
Unlocked: Level 11
AK74u
Unlocked: Level 17
Uzi
Unlocked: Level 23
PM63
Unlocked: Level 29
MPL
Unlocked: Level 35
Spectre
Unlocked: Level 41
Kiparis
Unlocked: After buying all other Submachine Guns
Shotguns
Olympia
Unlocked: Default
Stakeout
Unlocked: Level 8
SPAS-12
Unlocked: Level 24
HS10
Unlocked: After buying all other Shotguns
Light Machine Guns
HK21
Unlocked: Default
RPK
Unlocked: Level 6
M60
Unlocked: Level 21
Stoner63
Unlocked: After buying all other Light Machine Guns
Sniper Rifles
Dragunov
Unlocked: Default
WA2000
Unlocked: Level 10
L96A1
Unlocked: Level 27
PSG1
Unlocked: After buying all other Sniper Rifles