Made cheap. Nice addition to a collection, at least, for the sake of having one.
Yours have the adjustable sight still? The adjustable portion of the rear sight is usually missing. It is a stamped sleeve looking unit with two screws, that clamps on to the die cast rear sight.
The spring clip that holds the grip half onto the CO2 cylinder is the other usual broken part.
Mine leaks. Always has. If it bothered me, I'd fix it, but I don't shoot it or need to, so it sits...
Cheers
Trev