Not wanting to disagree with or be pedantic about AdeE's answer, but the rifle supplied by Enfield was the rifle alone, CORRECTLY drilled and tapped for the mounts. This was because the rifle was at a price fixed/agreed between the Home Office and the Ministry of Supply and another technical reason. What they wanted EXTRA was a matter for them.
I say drilled and tapped CORRECTLY but I say this tongue in cheek because Enfield drilled and tapped the body/breeching up ring only and NOT into the barrel. Whether you think that securing a mount and telescope onto a 3mm or so breeching up ring is mechanically 'correct' is quite another matter. Later, some gunsmiths or enthusiastic amateurs knew 'better' and deepened the mount screw holes into the barrel - and in a couple of celebrated ( or not, depending on your point of view.....?) cases, found after the rifles were returned to Enfield as faulty/harsh extraction. it was discovered that the new deeper tapped holes had almost entered the chamber. Not quite, but the fired case had expanded itself into the weakened chamber wall.
I think I've mentioned this before but have added to it slightly in view of a bit of info I learned from the Examining staff at the time.Information
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