दिल्ली विरोधः पेलेट गन क्या है और यह विवादास्पद क्यों हो गया है?

Media reports suggest that pellet guns were used in the protest at Jantar Mantar on Monday. At least three people are said to be undergoing treatment in Delhi hospitals for pellet injuries. However, what is a pellet gun? Why is there so muc