Need help identifying this Sten

[Vincent]

I couldn’t find a picture of attachment block I was talking about. I did find a slightly different one. It will give you an idea of how it works.






It’s a semi-auto version. The slot in the block prevents the tripping lever from being moved into the automatic position. The round hole is for the pin that holds the trigger mechanism housing in place. Anyhow, you can see how the housing is attached and why the ears are not needed.