Airsoft Canada - Upgrade Glossary

First off, I'm not new around here and I have a pretty good idea of what I'm doing, and I know how to use the search function - all this has still resulted in one thing: a lack of information on what exactly upgrades do. I discovered this while picking up parts to upgrade my CA M15.

That being said, I thought that perhaps we could make a glossary/dictionary or an Upgrades 101 section that contains different information on what exactly different parts do once you change them out.

For example:
Part: Upgrade Springs:
What does it do?
- Will increase FPS depending on the spring you install
Notes to Consider/May also require (with this part):
- May require upgraded gears depending on the strength

Part: Nozzle
What does it do?
- Shoots air into the barrel
What does getting a new one provide?
- Faster air into the barrel
- More FPS

Note, the above are only for examples as I'm not an expert on this topic. But, We could compile the info for all different AEG internals, and have a quick way to see what upgrades work for different people; for example again: ported vs. unported piston heads. This might reduce the questions about which upgrades people need.

Perhaps a template:

Part:
Function:
Upgrading serves the purpose of:
Other considerations/Other required parts:
Disadvantages of this upgrade:

Post away, and hopefully this helps the next guy who is trying to find out "What does part X do anyway?"