FAS604 Mk2 trigger problem

[kj68]

Hi guys my FAS604 wont fire, its been shooting great this morning, then I heard a rattle turned the pistol upside down and a small piece of black metal plate fell out, i then reloaded my pistol and now the trigger won't fire now can anyone help me or does any of the guys know anyone who knows how to fix these pistols.

kj68