Airsoft Firearms come in all different models, makes and styles from lots of different manufacturers.

Basically if there is a real world gun out there you can guaruntee there is an Airsoft Firearms version of it available somewhere.

You have 3 different power sources for Airsoft Firearms

1. Spring (ASG) - Generally in Sniper Rifles but also some low end assualt rifles (generally not advised for skirmishes)
2. Gas (AGG) - More realism as most offer a blowback action to imitate a recoil from the weapons. (Can be tricky in winter though)
3. Electric (AEG) - This is the staple for most Airsoft weapons, battery, gear and piston operated its a great all rounder.

Below is a selection of the type of Airsoft Firearms that are available.
 

Airsoft Pistol (Usually around 270 -350 fps gas or electric)

Airsoft Assualt Rifle (Usually around 350 fps gas or electric)

Airsoft Support Weapon (Usually around 350 fps usually electric)

Airsoft Sniper Rifle (Usually around 350 - 500 fps Spring Gas or electric)