L42A1 barrel profile

Reference books & my internet skills have let me down.
Does any one have the specs for an L42A1 barrel profile?

Do you mean the earlier version with the "snake-skin" hammer-forging marks or the later stepped version with the smooth profile?

The stepped version thanks.

Quote:

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Originally Posted by Macca

The stepped version thanks.

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Can't help myself then, but someone here can.