There were several generations of the Turner family in the gun trade , several were gun barrel makers .
Thomas Turner born 1805  first recorded in 1834 has a gun barrel maker at 5 Aston Rd Birmingham.In 1838  he was recoreded has a gun and pistol maker of 8 Fisher St.
Along with Mr J F Swinburn and W Siddons he filed several patents for breech loading guns and rifles .
He was contractor to  H.M War dept  to make  Major Nuthall,s patent rifles.He was a keen marksman and competed at Wimbledon and other rifle matchs.
Has for your pinfire patent I have not come across this one make inquiries at the Patent Office they may be able to help
Feltwad