I had a high grade Garbi that 1 out of 100 shots the left lock wouldn't cock. I looked and couldn't find the issue but called JJ Peradeau at Champlin Arms, where the Garbi came from. He quickly identified there might be a little bit of wood keeping the sear from going back far enough to cock. With his guidance I removed microscopic amount which fixed the problem

This ain't a dress rehearsal , Don't Let the Old Man IN