The prosecution wants to know if the gun was ready to fire or not. The police officer sent out with the exhibit is to examine it more closely. He recalled and confirmed the safety catch was off but the gun was not ready to be fired - two hands would be needed to fire it.
Under cross examination the Pc agreed there was "no way the gun was in any condition to be fired straight away".
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A man who fired at officers from the National Crime Agency has been convicted at the Old Bailey.
Want to know its posh name? It's a 'Track Retrieval Device'.
Unite said its members in the capital's 18 bus operators had supported walkouts by 85%, and action short of a strike by 9-1.