Terry, I have here in front of me a rather scarce book called Gun and Gun Part Makers of Staffordshire by M.A.Newland which was privately published in small numbers. He lists seven Graingers with two James' and one John. I'll give you what he has on the James'. John was listed as a Gunmaker who emigrated to Toronto believe it or not. Anyway on to James:

Grainger James. Gunlock maker in Wolverhampton, Staffordshire, from 1853 to at least 1856. Maybe the same man as below, or perhaps his father. James Grainger is included in the list of exhibitors at the Great Exhibition held at Crystal Palace, London in 1841. Catalogue Entry No.278 states that J.Grainger of Wolverhampton, Staffordshire exhibited tube and bar action guns and rifle locks.

Grainger James. Gunlock maker at No.31 Upper Vauxhall Street, Wolverhampton, Staffordshire from 1871 to 1874. May be the same man as listed above, or perhaps his son. Lagopus.....