To the best of my knowledge CRPF does not perform 'intentional' kinetic operations in Kashmir; they're there only in a supportive role (unless something changed in the last few months!).Why they were carrying it ?
Well to smoke that pig. Those above pictures of CRPF jawan carrying CGRL were from Chattabal Encounter 5 May 2018.
And this is the result.
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As such I am doubtful that CRPF used CGRLs to blow up that building. That's the army's job.