In a perfectly mathmatic world: 4. Realistically 2 and a half just from leaked air and lack of pressure after fills.
Yes. Standard 9oz through 20oz CO2 tanks work perfectly with the MR1. Compressed air paintball systems work fine too, with a regulator.
No, they must be filled (and not with air). The only exception is the silver 12 gram cartridges for pistols and stock class guns.
It depends on where you take it. I live in Georgia and go get my tanks filled at Dicks. In Canton the price is $2.99+tax for a 9 oz, and 3.99+tax for a 20 oz. And in Cumming it is 1.99+tax for a 9oz, $3.50+tax for a 20oz. So it depends by store but I would take it to Dicks because they have been the cheapest place I have found.
No co2 tanks are sold full.
Last I checked sports authority does not fill HPA tanks. If you are looking to get a tank filled though I would not suggest going to sports authority unless it is your only option. I used to work at one and the employees there really do not know what they are doing when filling tanks and you would be fortunate to get a half full tank when you walked out.
A typical paintball canister contains compressed air or CO2 at pressures of around 3,000 to 4,500 psi. The amount of CO2 in the canister can vary depending on the size and pressure it is filled to, but a standard 20 oz canister typically contains around 14-16 oz of CO2.
20oz is approximately 0.566990 kilograms
The Air Tank says 66KG. So that would be 145.2 Lbs. The C02 tanks come in 20oz or 24oz
$25 for 24(case) 20oz bottles.
The UPC code for 20oz Barq's Root Beer is 049000023923.
I use a 12 ounce, it lasts me a full day, but you might need a bigger one (20 ounce) if you shoot a lot of balls (eg. automatic firing) Tanks are a lot of preference but largely the 20oz is the standard co2 tank that will offer on a typical entry level setup about 1500 shots. For HPA whatever size you get, get it in a 4500 psi tank, that way you will get more shots out of the same size tank. The 68/4500psi has largely become standard for HPA tanks and will give you around 1300 shots on an entry level setup
~$30