Conversation so far:
What happened during Bhagat Singh's trial for the murder of John Saunders?
Awaiting trial, Singh gained much public sympathy after he joined fellow defendant Jatin Das in a hunger strike.
What was Bhagat Singh on trial for?
Bhagat Singh was on trial for fatally shooting a 21-year-old British police officer, John Saunders.
How did hagat Singh's trial for the murder of John Saunders go?
Singh was convicted and hanged in March 1931, aged 23.
What else besides a hunger strike happened during Bhagat Singh's murder trial?
The jailed Bhagat was reported to be elated, and referred to the subsequent legal proceedings as a drama.

Question: What did other witnesses say concerning the gun?
Self-contained rewrite: What did other witnesses say concerning the gun in Bhagat Singh's murder trial?