"T" things that shouldn't exist

[Lee Enfield]

According to Skennertons "The Broad Arrow" British and Empire Factory Production, Proof, Inspection, Armourers, Unit & Issue Markings 2001 issue.

On Page 41 Production markings for the Rifle No.4, .303 Mk I & Mk I * the stamping query identifies M 16 as Bullers Ltd., Tipton, Staffs.

Sorry the manufacturer of the Fore-end was Fazakerly in 1956, my question was regarding the additional marking of M/16 which I assume to have been a workshop/repair depot or individual armourers identification marking.