The Small Arms Identification Series is an ongoing series of durable 48-page large format identification, armourer's, service, and instruction manuals. Each manual contains detailed assembly & pattern drawings, and has durable thread-sewn binding & plastic laminated covers. Armourer data plus the various No.4 and No.5 serial number ranges so that a ‘fake’ No.5 can be readily identified. Original lightened parts between the No.4 & No.5 are also compared. 48pp.