Another angle from a hammer fired pistol; you can see the difference in the stryker action:

Also, here's an interactive animation of a 1911: http://www.m1911.org/loader.swf

How an AK-47 works:

How a Beretta works:

Glock reversed:

Glock is a striker fired pistol.

Revolver:

Hammer fired pistol:

Pistol upvote!

I didnt know the whole barrel moved for rounds to cycle. I assumed the spring did everything.

I was surprised by that too. Different guns have different mechanisms. Some are entirely spring.