The fact that the barrel is marked " Treble wedge fast bolt " could mean it was built whilst Greener still had patent rights in force .That would be for 16 years after the date of patent. It could also mean that Willis was trying to impress his customers with the point that his gun was build along the same lines as Greener, and so cash in on his publicity and advertising. No hard evidence for this assumption but they were devious lot in Birmingham always trying to get one over on the competition.
