While I can't attest to any work that was performed on the H.F. II guns, post production, it's fairly well known that they were pretty rough right from day one.
There was a knuckle head that used to post here, who questioned how this could be the case, until a photo showed up in one of the gun mags.
Haven't seen him since.
I suspect if someone springs for a model 24 or a later 311, they have an idea they might not be getting a Purdey. But, I'm pretty sure H.F. II thought he was getting Purdey's, since, he ordered them, and what he got was sub model 24 or 311. 311s, say what you will, usually can be assembled and will go off when the trigger is pulled.
Best,
Ted
