Argo44,

I have complete information on 750 of Powell's patent action pinfires. The guns were sold
between 1864 and 1891. None of them are described as having rebounding locks. Some conversions to CF were equipped with rebounding locks but there was an additional cost of 1. Centerfires overtook pinfires c.1868-69.

Powell started supplying rebounding locks in 1867.

I haven't examined the Rigby books with these questions in mind but my impression is
that Rigby would closely mirror the Powell experience.