Just to add to the sudden surge of Dragon threads...

I've just gone to shoot my dragon there and nothing happens. It feels almost as though the sear hasn't engaged or hammer not cocked.

Gun currently full of air and a pellet in the breech (although I might knock that out with a cleaning rod in a moment to make safe)

Any tips on resolving? Gun is definitely charged as I can feel it 'suck' when trying to open the cocking lever.