The XP 110 is a pretty good weapon for its size. It features 2 mid-sized compression tanks, and a relatively small main tank. This gun is air powered, and thus does not use the CPS system, but what do you
expect from a gun so small?
The output is not the best of the best for XPs, but it is a great output for it's size, especially considering it's a Air powered weapon.
The 110 takes about 10 pumps (may be a few more, I haven't used it in a long time), and features a pressure gauge on the side. DO NOT pump this weapon when the gauge reads full, because I've heard several stories of the PTs flying straight up.
Not only is this gun a good backup weapon, in certain circumstances it can be used as a main weapon. Just watch out for CPSs and Monsters and such. If you meet up with one of those, run unless you're clothes happen to be made out of Teflon ;)
This gun is almost a must buy, just don't expect it to compete with the likes of the CPS 1000.