Schrager Brothers Factor X2 (stock and upgraded)
Schrager Brothers Shadow (stock and upgraded)
Tippman 98 custom, Response trigger, expansion chamber, velocity adjuster, rocket cock and powerfeed
Freak Barrel (Spider thread and Tippman 98 adapter) All diameters in stainless
Pure Energy 3000 PSI-72 Cubic Inch Steel air tank
Any because the system allows you to match ball to bore
Wide variety of inserts, adapters and end pieces to adjust to play conditions.
I have tried and failed to find barrels to meet all paint diameters.
I had (5) barrels from different manufacturers with me while playing.
I could, most often size the balls and use one of the barrels.
Some time older paint was available and was larger than what I had for bore size.
This means keeping a huge stock of barrels in different diameters and lengths to meet available paint diameters and play conditions (winter, summer, etc...).
I play at fields that require the paint be purchased onsite. They often get different paint weekly which means also varied paint diameters.
I played at my field and purchased Marbalizers. I sized the balls and found them to run very small in diameter (.684) My normal barrels are .691.
The Freak system allowed me to find the best insert and match the paint.
The resultant match was perfect. Long distance accuracy due to ball bore match.
My teammate used the same balls with standard barrel and his shots were all over the place.
I can range from (.682 to .697) in size and still maintain effective ball bore matching by simply swapping out inserts. I can also change from my Tippman 98 to my Schrager Brothers Shadow (Spider thread adapter) by changing base components. Back into the game in minutes.
The Freak System allows you to match ball diameter to bore.
You can't get much more accuracy from a round paintball.
Using this and an High pressure air tank instead of CO2 will also improve overall results.