L42 Barrel or Later Commercial Variant? FB613

[Cold_Zero]

Managed to pull the barrels out of storage again. I used a 1942 Long Branch barrel to compare threading, looks like a match. The barrels are 4 groove, slightly over 27.5 inches on my tape measure. Chamber accepts 7.62 round.

At the end of each barrel they are stamped "NOT PROOFED".

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