I read the 1910-11 W.J.Jeffery catalog a bit different. The British gunmakers bought in the M1892 Mannlichers from the Steyr factry as complete rifles from the military production line and sporterised them to varying degrees. So Jeffery's grades 4,5,6 and 6A even retained the straight grip military stock wood, merely shortened, reshaped, checkered and refinished to the different grades. The sentence on page 51 reads: " These rifles can be finished dead black ALL OVER "(emphasis mine). The Romanian and Portuguese military Mannlichers came from the factory with the bolts polished bright, unblued. So I understand Jeffery's remark this: Jeffery offered these rifles with a dull rust blue all over, including the formerly bright bolt assemblies.