I'm looking for a second hand carbon fiber tank but i don't know much about them, so is there anyone who can tell me some of the pros and cons of the different ones?
the differences between the actual tanks are minimal, other than the size of the tank 48cu=0.8l, 68-72cu=1.1l ish, 88cu=1.5l, its just the weight, bottles like safer, zen etc are really light, others are a little heavier, but still going to be lighter than the equivalent aluminium bottle, plus you can fit in 50% more air if you have 4.5k fills available which we do.
The reg is the important part of the tank, as this is what controls the air going through your marker, you have low, medium and high pressure regs, if your going to be using a blowback, BT4, Tip98, A5 or X7s you will need a high pressure reg, tourney markers etc are usually fine with any as they have regs to control this, the only one i can think of being awkward are angel markers which require LP regs. your etek will be best with a medium if you can find it otherwise any but LP will do(rare anyway). Regs also vary in length with myth regs being very short, good for keeping a compact set up, other are longer, like pure energy and throttle regs meaning your marker is going to be an inch or so further away.
Some regs are also better at keeping a controlled psi going thru your marker, making your marker more consistent over the chrono, others advertise a good recharge rate, so if your ramping/high rates of fire, the reg will keep up and make sure that 650(etc) psi is being released from the tank for every shot.
Ninja regs are the nuts, with the pro being the top one, allowing you to change the position of the bonnet so you dont have a fill nipple poking in your wrist, the new myth regs also allow you to do the same.
If your just after a cheap one to get you shooting more paint, ignore all of the above and just buy a 1.1/68cu with a decent amount of test.
all carbon bottle are subject to hydro testing every 5yr, costs about £25. usually takes a week or two, so if you buy an out of test bottle you may get a bargain, but it also could fail, so youve lost all your money, so unless you can buy it face to face and make sure there are no worrying scratches or worse cracks, dont do it, plus you cant buy an untested bottle from here, for that reason i imagine.
Hope this helps.
Paul