Fake case of "Hindu Terrorism" ?

The ATS of Mumbai, blew it's trumpet when it claimed to have exposed a "Hindu Terrorism" plot by Sadhvi Pragya and Lt Col Purohit.

Karkare, who was a Congress supporter, headed the ATS at that time. Under the orders of the Congress, he desparately tried to link the Malegaon blasts to Hindus instead of Muslims, so that the muslim community would be pleased and vote for the
Congress.

He tortured Sadvi Pragya to try to make her admit that she carried out the blasts.
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Fortunately he was unable to do so and this strong lady stood by the truth.
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In desparation, he arrested an army Lieutenant who was incharge of the RDX explosives for the army. This was mentioned in all the headlines of all the "seculiar media" for over a week, which supported the "Hindu terrorism" allegation of the Congress.
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The Congress and Karkare ran out of luck when they discovered that RDX was never used for the Malegaon blasts !
They finally had to withdraw their statement !
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To save face, the Congress and Karkare disparately tried to find a way to keep Purohit arrested and he found some problem with his renewal of licence of his revolver.
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My question here is, bombs were used in the malegaon blasts and not revolvers, and how did a revolver become a bomb ?