The rare WW1 snipers SMLE includes it's Rifle #4 magazine I see.
With the #4 Rifle having come to be in the late 1930's, that is quite a trick.
I must admit I didn't listen to the link, just ran through it looking for a couple things. Maybe that's pointed out
I was looking to see if the socket marking were shown. I saw one distant quick look and it appeared as a Standard Military marking but partially obscured by the closed bolt handle as it would be.
Being a Private Purchase SMLE,,the piece would only be marked BSA&Co on the socket.
That is the spot normally marked with the Royal Cypher, year of mfg, Mfg'r name and the
designation MkIII or MkIII* on Military rifles.
(There would not be a 'No1' designation along with the MkIII(*) as that rifle numbering system didn't come about till after WW1,,around 1927).
Private purchase Enfield Rifles and Carbines as well as the sporters were available from BSA at least to WW1. I'm not sure about after that.
They are commercially proof marked, have the BSA commercial logo (3 stacked rifles) marked on the KnoxForm of the bbl along with another stamp that
indicates the rifle/carbine was made and sold as a Commercial product.
A private Purchase marked SMLE would have been plain as daylight over a Military issue SMLE. It's markings and then total lack of others (Military) telling a quick story
They are beautifully made pieces. I have both a commercial made MkI*** SMLE and a CLLE w/ Metford Safety.
The CLLE is also Retailer marked on the bbl.