If you type VSR10 into the search field at the top...you get back LOTS of info...
These are two very helpful ones...might have to reread them after you've found out more of what's what...but they're good.
http://www.airsoftcanada.com/showthread.php?t=27286
http://www.airsoftcanada.com/showthread.php?t=37455
Unlikely that either of them mention sorbo pads...you can use the search for that as well.
- sorbothane is a squishy rubber that spreads the impact shock from the piston over a longer period of time...preserving the lifespan of the pieces that take the shock.