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An expansion chamber is a fore-grip that lets the CO2 expand, so it's not just sputtering through the hose-line with little bits of liquid CO2. It keeps the CO2 temperature more constant (cuz varying temperatures mean diffirent pressure/volume, both of which will make your shot consistancy go down the ****ter- which will affect your accuracy and range in a big way.) It's something like a regulator, only less trouble-prone with CO2.
A LP, or Low Pressure, system lowers the input pressure of your CO2. The going myth is that it makes your marker more 'consistant' or 'efficient.' Not true, but it will make your set-up quieter. Not all that worth it in my book.
Inline = (?) short hand for "inline regulator."
Not all that nessecary if you're going with CO2. In which case, I reccomend an expansion chamber, again.
Raise clamp = a type of vertical feed that clamps onto the hopper. Only really worth it if you use a wide variety of hoppers or are having trouble fitting your current set-up.
CP Rail/Unimount = A sort of drop-forward. Not entirely important with CO2, again.
Eyes = paint sensors that detect weather there is paint in your breech before firing. Usually come on the top of an after-market trigger frame (right where the breech would be).
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