Tippmann 98 Custom [Easier to clean and disassemble, horrible stock barrel, more reliable, a little more expensive]
Tippmann A-5 [Much faster, more complex, heavier, better standard set-up, much more expensive]
Kingman Spyder Victor II [Terrible for stealth, ergonomics are terrible, fairly cheap]
32 Degrees Rebel 02 Electronic Bottomline [Significantly improved reliability, durable even dropped in a stream]
32 Degrees Rebel 02 Bottomline [Black]
32 Degrees Expansion Chamber Bob Long Style [Black]
Catalina Cylinders 20 oz. CO2 tank [Black]
Viewloader V200 Hopper [Flat Black]
J&J Performance 14" Ceramic/Teflon Barrel [Flat Black]
20 oz. CO2 tank with expansion chamber.
New barrel, preferably the one I have.
If you have the kind of money for more significant upgrades, don't waste your money getting this gun to begin with.
*Fairly accurate out of box [mine came with 32 Degrees 10" Night Stick].
*Air system has problems.
*Ball latch/cartridge stopper wears out quickly.
I originally purchased this marker from 888paintball for the low price of $70. I got it because tons of people had Tippmann 98Cs and I wanted something different, a little cheaper, but still reasonable. I wasn't disappointed at first because out-of-the-box, mine out performed theirs. However, the Tippmann has better reliability and is constructed better.
If you want to be different from everyone running around with Tippmann 98 Customs, this isn't a bad gun to consider. However, cleaning up more than the barrel during a game is impossible and cleaning up fully afterward takes much more time.
If you have slightly more money [still $45 less than the cost of a Tippmann 98 Custom] and want something different, go for a Rebel 02 Electronic Bottomline. That thing has never had any problems, even after I dropped it in a stream. Definitely worth the extra $25 dollars.