Ross PLY markings

[buffdog]

Has anyone deciphered the PLY markings on Ross M-10 rifles. I have seen or referenced at least 14 different Ross M-10s with PLY markings and different numbers stamped on them. I really don't think it stands for something like "Pakastani Light Yeomanry", but with so many rifles stamped with those numbers, it is a bit of a puzzle.

These are found on the Barrel, near the receiver ring.

There are also Ross M-10 rifles with PHAB stamped on them.

Can anyone solve this little mystery?

ADDENDUM: O.K., O.K. We are NOT talking about Ross M-10 Sporters here, We are talking about M-10 Military Ross .303 British Calibre rifles with the typical military markings on them that were apparently converted to a Sporter somewhere along the way. In addition, the ones I have seen have a "Not English Made" stamp and British proof marks. So far, the top number is PLY 6009, so if the series was started at 1000, then there had to be at least 5000 rifles that were converted.

Thank you for attempting to add to my education. While my first love is the SMLE and Lee Enfield Rifles, at several times during my 69 years of age, I have had, bought, sold, and fired several Ross rifles, including M-10 Sporters in .280 Ross, M-10 Military Ross rifles, 1905 Ross rifles, and .22 Ross rifles. While you never stop learning, I have NOW learned that I should have specified Ross M-10 MILITARY converted sporter in my post, to avoid the nit-pickers!
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