I am a gun collector from Hungary. I collect deactivated firearms from both World War I and II. I am also interested in military airguns and not long ago I managed to obtain a very nice VZ. 47 military air rifle. After the first few shots however the bolt stuck in position. I cannot turn it upwards. Is the problem something simple or do I have to get a whole replacement bolt for the rifle? My other question is that so far I have been using lead 4.5mm BBs for shooting but since they are hard to get I bought steel BBs instead. Do the steel BBs cause barrel/rifling wear or am I safe to use them in the gun?
If someone here speaks english well and knows about this gun please help. Thanks.

