What is the plastic stick thing called that you shove airsoft pellets into the airsoft ammo carrier?

that would be a standard mag loading rod. i would use a speed loader. check out airsplat.com they have them and they are cheap.

a magazine! Look up your gun on Airsplat.com and the compatible mag should show up on the right hand side! Good Luck

you should be able to order another mag from a number of sites as long as you know the type of gun and model you should be fine!

the magazine. And if its plastic, you can't typiclly buy a replacement, as that means the gun is very cheap.

The item that carries ammo is called a magazine, a historic term, and the first item referred to in your question is called a charger. This is directly related to mauser rifle chargers. Look it up on wikipedia.