What is a C02 cartridge?

Is the 223 savage axis rifle a good hunting rifle? How do you get a Gun Runner Guard to open the gate for you? How do you assemble a high standard D-100 derringer? How the ak47 got its name? Any info on a sxs 12 gauge made by armas bost eibar? What is the value of a Universal Firearms Corp Hialeah Florida Model 2036 12 gauge double barrel? Why is there no info on a wertern field model 50 12ga shotgun? What is the value of a limited edition Browning Sweet Sixteen with a gold trigger made in Belgium that has never been fired? What is the value and date of a model 94 30-30 worth winchester? Can you shoot 22 cal LR in 22 Mag revolver? What does 14k Gw stamped on the inside of my ring mean? What is a palmetto arms co 54 cal T5 ml in line muzzle loader worth? How old is a Browning Sweet Sixteen serial number 0S-58789? Simson and Co 22 bolt action rifle you are trying to find out more about it? What is the value o a Crescent side by side 410 shotgun exposed hammers serial number 6252 has engraving quail gun and barrel has belgium laminated steel? What is a JC Higgins Model-100 worth? What year was a Winchester model 94 30 wcf serial number 1214508 made? What is the manufacture date and value of a Mississippi Valley Arms 12 gauge double barrel shotgun with serial number 07708 under the forearm? What is the age of a 300 Savage model 99 serial number 782969? Where can you find the value of a Belgium made double barrel shotgun by T B Janney that has Twist Belgium on barrel?