The following weapons are available in the game:
Pistols
1911 Custom
Desert Eagle (originally used by Meryl)
Desert Eagle Long Barrel
Five Seven (gun used by Snake when he infiltrated Galuade)
Glock 18C
GSR (.45)
Mk 2 Pistol (Tanq)
Mk.23 SOCOM (Snake's main handgun from Metal Gear Solid)
Operator (Colt .45 with extended barrel)
PMM
PSS
Race Gun (fires ricochet bullets)
Solar Gun (causes enemies to drop weapons and does extreme damage to Vamp)
Thor .45-70 (rifle pistol)
Type 17 (broom handle machine pistol)
Sub-machine guns
Bizon
M-10
MP5sd2
Mp7
P90
Patriot (The Boss' weapon; has unlimited ammunition)
VZ. 83 Skorpion
Assault rifles
Ak102
An94
FAL Carbine
G3A3
M4 Custom
Mk.17
XM8
Sniper weapons
DSR-1
Heavy machine guns
HK21E
M14EBR
M60E4
M82A2
MK.46 Mod 1
Mosin-Nagant (The End's sniper rifle)
PKM
RAIL GUN
SVD
Tanegashima (old flint lock that is very slow to reload, 33% of hits causes a whirlwind that carries off enemies making them drop items)
VSS
Shotguns
M870 Custom
Saiga-12
Twin Barrel
Grenade launchers
MGL-140
XM25
Rocket launchers
Fim-92A (Stinger)
Javelin
M72A3
RPG-7
Weapon modifiers
Dot sights
Flashlights
Fore grips
Grenade launchers
Laser sights
Masterkey (under barrel shotgun for assault rifles)
Scopes
Suppressors
Others
C4
Chaff grenade
Claymore
Grenade
Knife
Molotov cocktail
Sleeping gas mine
Sleep gas satchel charge
Smoke grenades (yellow, red, blue, green)
Stun grenade
White phosphorus grenade