Opening a Trojan Grade 12 Gauge--

[Kensal Rise]

My bet is that something is causing the right tumbler to re-cock out of time. This would allow the firing pin tip to stay in the fired primer's indent too long, and not withdraw in time to allow the gun to break without noticeable drag.

This is just a guess. A hands-on inspection by a qualified double gunsmith is necessary to determine the actual issue at hand.

[Grantham Forester]

I also wondered about the coil hammer spring for the right side barrel, as usually, the right side or, more open choked in most cases, barrel is usually fired first in field hunting situations. Who can you recommend as being Parker qualified? Thank you!!