I suggest you go to the Daisy web page and fill out the form to get the parts you need. See the link below.
You may be asking about a Daisy Model 1700 (Copy of a Glock) It was dark Grey in color and made between 1991-1996
I would contact Daisy directly and ask them See the link below
Please state the current condition of the pistol to get an estimate of value. Give it a rating like Poor, Fair, Good, Very Good or Excellent condition.
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 would start by checking the web under "Air Gun Repair" or see the link below.
I would suggest contacting Daisy air gun directly through their Customer Service. See the link below
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
On the back of the pistol you will find a long lever, slide it to one side and load in your BBs. Under the barrel you will find a thumb loader to load each shot into the firing chamber between each shot.
the C02 seal is shot. time to install a new seal. check with customer service at the link below.
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.
If you are asking about the Crosman C02 pellet pistol then Yes that is what it is designed to power the pistol.