Standard Products Marking?

[glock26ph]

Hi All,

I recently acquired an M1 carbine. It appears to be a mixmaster (recoil plate is marked "Rock-Ola", Barrel is underwood, 11 - 43 and the bomb icon), it also has late model upgrades - rotary safety, barrel band with the bayonet lug and the adjustable rear sight. The serial number is clear - 20799XX but the Manufacturer's stamp on top of it is obscured by the rear sight. I can barely see what appears to be "ST" and "CO." on the other end. How are the Standard Products' carbines marked on the receivers?

Thanks a lot!

Information

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[ScottR]

Std. Pro.

[glock26ph]

Thanks Sir!