Bren 3/1

[Lee Enfield]

All the above info is really great, but is there any evidence that either the Englis factory or the Enfield factory took MKI receivers and machined them to become MK3 receivers? This is what the discussion was about. Thanks for everybody's help and input.

The simple answer is "No, it cannot be done".

You cannot machine a MkI into a Mk3.

India machined MkI receivers into a lightweight variant which they termed the Mk3/I - but which we could more properly call a MkI/3, perhaps this is what has caused your confusion?