SP freak (not a solid back)
Python compression system (insert but friggin awesome!)
Aradus (adjustable barrel)
Smart Parts SP, jj edge elite kit with apex tip, Revo II hopper, various tanks
Autococker trilogy tactical, python kit, jj ceramic barrel, evo II hopper, various tanks
Tippman A-5, various barrels, python kit, various tanks
Spyder Shutter, various barrels, python kit, various tanks
Rex R2, same as shutter setup, Evo II hopper.
Not really bad, but they sound terrible when assembling the back to the tip.
Light, accurate, quite, sexy
perfect kit. the solid back is so much better than the insert kits. doesn't feel flimsy @ all.
I have the complete kit ion threaded with 12", 14",16" tips and 5 backs. I have yet to break 1 ball after 7+ cases shot through it with my sp1! no joke this thing is so quiet. i added the apex tip and OMG! unreal, I never thought paintballs would act more like darts. seriously for the money i think its the best kit out there. oh and its J&J ceramic so that alone should say enough about it. it basically a jj ceramic barrel with bore sizers.
I couldn't be happier. get one. amazing how well this works. playing paintball since 96' and wish i had one sooner. its perfect.