which nitro is best

Fair weather only, eh?

You usually want to get a 68 ci 4500 psi tank, this is probably the closest you can get to a 20 oz CO2 tank (shots per fill wise) without getting a gigantic tank. These are upwards of around 200 dollars though.

You could go for a smaller psi rating (3000 psi) which would give you less shots per fill, but much more affordable around the 100 dollar range.

Also, make sure you purchase a High Output tank (800 psi) for it to work properly with your gun.

You don't really need any other accessories. Some people get a secondary regulator to help with consistency, but it's a minute difference. You'd only really need one if you get the Comp-Air system (also called Low Pressure Kit *LPK*), which is a highly optional upgrade. Most say its effects are negilible, others say its worth it.

As for brands, Crossfire is common. I use a Nitro Duck Tuff Skin 4500 psi tank. It has an extra coating around the carbon fiber to help protect it.

Oops- you do need one accessory. You'll need a tank cover IF you get a 4500 psi tank (or a 3000 psi carbon fiber). The best tank cover is the Dye Rhino, and another popular one is the Redz tank cover. A 3000 psi steel tank is strong enough on its own, so you won't need a tank cover if you get one of these.

He means multiply it by how many cubic inches. If 48 cubic inches, multipl it by however many was recommended per psi. So if it's a 45ci 3000psi, 45 x 10.

I think

Johnny5 wrote: How many shots do you think an a-5 will get from a 68ci 3000psi and a 68ci 4500psi?

For a 68/3000, around or less than 650. 68/4500- around 1000.