Yep... that's the area. I didn't pay to much attention to it and wasn't thinking much about swept volume either excpt that as is, the gun is only capable of so much power and that's it. The reason that they get the power that they do out of the box is because they are so loaded with oil (the seals that is). Once it burns out, some of the velocity will drop and unless the lube is maintained at a reasonable level, the consistancy will change and/or velocity loss (or excessive if over lubed). That's where the advantage of the synthetic seal comes in. No seal maintenance/lube required and a consistant level of power.
Also, I didn't take any measurement of anything except for the seal adapter and didn't even keep them. I figured for me it was a one shot deal and had it not been Gene's gun,.... no shot deal...lol...
To be honest, I usually just don't have the time to tinker like that. Besides, that makes it more interesting and challenging for the hobbyist.