The C02 powerlett in under the left plastic grip. Remove the left grip then unscrew the large knob on the bottom of the grip. Now you can remove the C02 cylinder and replace it with a new one.
See the link below
If the co2 cartridge is full unscrew the back slowly until all vapor is gone, then just unscrew the back all the way off and it will slide out.
I have researched this model and can not find any Daisy m2001 powerline. They did make a model 2003 that fired 35 rounds. it was made between 1995 and 2001. It was semi automatic. But it was a pistol not a rifle. If this is your pistol I suggest that you contact Daisy directly (800) 713-2479 and ask for an owners manual.
No it's a pump and no C02 is required
No it's a spring piston system
The 15XT has a built in seal.
The number of rounds a CO2 pistol can shoot depends on the specific model and brand. On average, a standard CO2 pistol can shoot around 40-50 rounds before needing a new CO2 cartridge. However, some high-capacity models can shoot up to 100 rounds or more before needing a cartridge change.
Remove the grip on the left side of the pistol and insert a C02 bottle. Load BB's through the door at the rear of the pistol. Tip it forward and push the lever ( It's in front of the trigger) to allow the BB to load. Aim and fire
The Model 150 uses any 12.5 gram C02 cylinder.
Take the left plastic grip off the gun. It should pop off. Remove the old C02 bottle (You may have to unscrew the bottom screw a little. ) Replace the C02 with a new 12 gram C02 bottle. Then using a coin screw the bottom screw in until it stops. This will charge the gun with new C02.
There is No C02 cartridge in the Marksman Repeater, it is spring operated
This model took an 8 gram CO2 cartridge. It's hard to locate them now, BUT a good substitute is an 8 gram Nitrogen (N2O) that you can find at any large Liquor store. They will work in place of a CO2 cartridge and they are not expensive. N2O is used to whip cream.
All Co2 cartridges are the same, they are just different sizes.