Pistol - The pistol is your basic weapon in every FPS, and it is handy when you are looking to conserve the ammo for your top guns. In Crysis if you pick up a second pistol off a corpse, then you can dual wield them, which is always cool. Clips hold 20 rounds and you can also get a silencer, which makes the pistol a decent stealth option.
SCAR - This is your standard assault rifle. It's lightweight, powerful, and can be fitted with all sorts of nifty accessories. Sadly there isn’t much ammo available for it, but it does feature a rapid fire rate, emptying clips of 40 rounds in record time.
FY71 - This is the Korean assault rifle which you’ll inevitably use a lot because there’s plenty of ammo for it. You can fit it with a grenade launcher, flashlight, silencer, and sniper scope. It has a single fire option too. It takes clips of 30 rounds but it doesn’t pack much of a punch.
Shotgun - Now you’re talking! The shotgun is a close range weapon capable of felling an elephant. There’s plenty of ammo, and you get eight rounds of pump action goodness before you have to reload. Of course, it is totally useless at long range.
Submachine Gun - The SMG is nice at short to mid range for peppering the enemy with bullets. It packs 50 rounds and you can tag on a laser targeting system, reflex sight, flashlight, and a silencer.
Sniper Rifle - Crysis calls it a Precision Rifle, but it’s a standard sniper rifle that takes ten rounds. It is accurate from any range and it will drop your target, but it’s slow to reload and you can’t silence it.