Rifles marked as "Lee-Speed"s generally are COMMERCIAL rifles built to the standard of the Mark II Lee-Metford.
They were introduced into British military Service in 1892 and manufactured until they were superseded by the official adoption of the Lee-Enfield rifle in 1895 (manufacture got into high gear in 1896).
The difference between a Lee-Metford and a Lee-Enfield was the rifling inside the barrel. Metford rifling was 7 segmental grooves, 1 turn in 10 inches, Left; Enfield rifling was 5 grooves, Left, 1 turn in 10 inches, lands and grooves of equal width, grooves quite deep. An Enfield-rifled barrel would outlast a Metford-rifled tube close to 3 to 1 with the highly-erosive Cordite Mark I ammunition in use at that time, although the Metford barrel was much easier to clean. Apart from the barrels, a Mark II Lee-Metford was practically identical with the Mark I Lee-Enfield, the one difference being the cocking-piece-mounted safety on the LE. Original Lee-Metford Mark II rifles had only the half-#### safety.
"Lee-Speed", thanks to the commercial sporting rifles made by BSA, W. W. Greener and a few others, became a synonym for a fast-handling, fast-working high-capacity smokeless-powder bolt rifle. For this reason, as well as sales of military-pattern rifles to small formations, "Lee-Speed" marked Lee-Metford rifles continued to be manufactured in small numbers well past the date at which they became obsolescent by military standards.
I have a Lee-Speed built commercially from an original military-pattern rifle which likely served in the Boer War and then was sold for surplus. It was rebuilt completely by A.G. Parker with one of their own 23-inch barrels installed. It has a gold front sight and is their serial number 0019. I am informed that they built it approximately 1920. I also have a full-wood military Mark II Lee-Metford marked as built by BSA as a "Lee-Speed". It has Service markings on the buttplate. It is one of the rifles used aboard the old HMS Calypso (renamed HMS Briton) and used to train the Newfoundland Regiment at the outbreak of the Great War. Hmmmm.... have to take the old girl out to the range this summer.....
You have a Fine Toy, sir! You will find that screws and many parts from an SMLE will work on your rifle, although the knuckle-joint trigger/sear is peculiar to pre-1902 rifles.
Welcome to the Worshipful Society of Collectors and Enthusiasts of All Strange Things Enfield!
Steve: You didn't tell me that you had a NAVY rifle!!!!! You will have to bring it along next time. My Lee-Speed wants to meet her! So does the SMLE I***!