[Eeyore]

Did you mean out of all airsoft guns or gbbr? The WE has tons of parts to upgrade it with, most of them are just steel versions if the stock parts however. Expect to have to perform regular service and maintanance on it, just like the real thing. After a while parts will wear out and will need to be replaced, but one of the greatest things about the WE gbbr is that the parts are relatively inexpensive and the mechanism is pretty simple to do the repairs yourself.