M1 carbine bottom pistol grip marking identification

[lweinlan]

Dear members, could someone identify and let me know the signification of the "A" and "5" markings as seen in the pictures ? Markings are located under the pistol grip of a WW2 M1 carbine. Are they US WW2 markings, post-WW2 markings, foreign markings, refurbished markings, arsenal markings ? The stock has a RMC cartouche (right side), a RMC in the sling well and no other markings besides those "A" and "5" markings under the pistol grip. What are they ?? Thanks

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