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USA standard are Yukon blend. See my thread in the for sale section of m4 about chromo shafts from pirate. Way cheap.
USA Standard shafts are made by Yukon - same materials, process, plant, drawings, etc. The U-Joint area specs aren't met. Meaning they won't hold a CTM or other aftermarket joint, so they are downgraded to USA Standard. As long as you are fine with running Spicer joints, this will never be an issue. They are still strong and etc.
Driver side was not far behind.
oh lord!
Any place good to get SYNTHETIC DYNEEMA WINCH ROPE?