I had similar experience with a low-end Spanish-made double in 1970s. Problem with that gun was that if one did not fully open gun, timing of cocking levers and sear engagement was such that one sear would barely engage. Unintended discharge on closing gun was result. Also found that safety would not prevent trigger from moving sear a bit, giving same result. Could a worn Fox have similar problem?
Through refitting of sears and reworking of safety was done and gun worked reliably for some years. Sold gun and will never buy another low-end, internal hammer Spanish double again.
Niklas
