Yes, best bb gun ever!
It has 2 drawbacks. A very long trigger pull and the loading chamber falls out when you open the breech it you are not holding it directly upright.
If you are asking about a Walther C02 CP99 compact, then the answer is No, It is designed to shoot BB's only
It is a pellet pistol and yes.
Umarex SA177 Walther cp99 Compact Those are really cool co2 blowbacks that are from $50-$80
Not intended for user to take apart.
Crosman, Daisy, Gamo and Umarex are the larges manufactures of BB guns currently in the world. There are several others but these 4 dominate the market. Good quality craftsmanship is going to cost you so expect to pay for what you get. One of the most popular is the "Walther CP99" or the "Walther PPK/S" by Umarex Both have the feel of the real thing and both have blowback action.
The CP99 is designed to shoot semi auto. There is a guy on you-tube who converted one to shoot full auto and he shows how he converted it. But once this has been done it can not be reversed. I believe over time the gun will wear out if it is converted. Personally I like the way it was designed originally.