Hello.

I have recently purchased a Lee-Enfield No.4 Mk I rifle. Please, bear with me. It is my first rifle and I might ask questions which may be common knowledge among rifle entusiasts.
Anyway, I have a few questions about my Lee Enfield. Any help would be greatly appreciated!

The first question: Serial Numbers and markings.
I believe I read somewhere that you can figure out where your rifle is from, when it was made and so on, with the help of its serial numbers.

My serial number starts with W 2XXXXX AO and a mark on the reciever which says 6KB. What does it mean?

The Second question: The Barrel
When the bolt is not connected to the barrel in the reciever, then it seems that I can turn/twist the entire barrel a few turns.
Is it suppose to do that or is it a free floating barrel?

When the bolt is connected to the barrel, I can still twist it a little bit to the right. Should I twist it all the way to the left?

The Third question: The Book for Lee Enfield
I have been recommended to buy "The Lee-Enfield by Ian Skennertonicon", but is it the best book to buy?

Best regards - Zigge
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