I was working with an xp110 w/ out a pump that a freind gave me (I have a leaky 110 so I desided to switch the pumps) and I noticed sveral diferences in the guns...
I am not sure if this has been discused elsewere but I have not seen it so I will talk about it here.
DIFFERENCES---
---the thread on the reservoirs (so that the cap will screw on) is different
---the tread and size of the cap for the pump is different (the opening of one is also smaller
---one gun has the different color handle grip painted on and the other has separate pieces for the handle (grip)
--- there are different colors in the preasure guages
--- nosels are a sligtly different shape (at the very tip of it)
I Don't no any internal things b/c I have did not have to actually take them apart to switch pumps.