Clarification on "Inventor" of the 300 "Whisper"

[Alleycat]

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Originally Posted by daveinsvaz

I have several 300 BLK/Whisper/30/221 in various forms (AR, Contender, 700 Remington), but recently I have found two unusual variations.
They are AR uppers. Shop made to left hand eject. Professionally made, but not a commercial item. The right hand port has been closed but is visible.
The handguards are heavy steel, not aluminum. They have three markings: "30 FB"; what appears to be initals "M.A.C." and a small symbol of three interlocked circles.
Barrels are very heavy 16" stainless barrels.
They are older. One still has an A1 'carry handle' rear sight. No forward assist. The other has the 'carry handle' machined off and a steel rail put on.
I believe thay originated in either Alaska or Idaho.
I have some pictures if someone could tell me how to upload them and the best format to utilize.

Dave Davidson
Sierra Vista, AZ