-Easy To Turn Up
When i bought my tippmann it lareayd had respone trigger installed for me. I went in my backyard and tested it. After fiddling with it for a little (which is insanely easy) i got balls flying out of my barrel. The only problem is that if you turn up the RT too far itll shoot so fast that yuor gun wont be able to recock fast enough, so if you find just the right spot it basically is a machine gun. I would highly reccomend this to anybody looking for a drastic upgrade to their 98. it says it costs 100$, but i have seen it around in the 60-90$ range...
Buy this, it effective, inexpensive, and will scare your opponents crapless...