My understanding is that the rifles were converted to fire the 410 brass round issued by the military, they were used in India around 1945-48 as riot control rifles firing birdshot at the feet of the prisoner. Unless they have been certified converted to 410 G then they should not be fired. Many were imported into the US and still are available here, I have 3 in my collection, but it has been converted to fire the 410 shotgun round. I have collected Lee Enfields for a number of years. They were also converted to shotgun to comply with the draconian gun laws in the UKicon. I hope this helps