I recently bought a Standard Products M1 Carbine. I've had many carbines but I have never seen a barrel with this marking. Can anyone tell me the manufacturer of this barrel?
Thanks
https://photos.app.goo.gl/yRF4ZJLmDEAQbc3m9
Thanks
https://photos.app.goo.gl/yRF4ZJLmDEAQbc3m9
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