What is this 'shield' mark on this M1 Carbine? **PICS**

[jjjxlr8]

I've never seen markings like this on the M1 Carbine before. Both the trigger housing and the stock have what looks like a shield. It almost looks like a horse or a lion inside the shield.

It also has some extra stampings on the bottom of the trigger guard and on the recoil plate.

What does this mean?









Receiver is a Standard Products and the barrel is Underwood marked with the flaming bomb.

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