I did some more reading and Nylon 66 refers to a broad family of plastics and the Zytel 101 is one formulation of it. Sorry, but the brown color has nothing to do with it.
I'd be interested to know what you've been reading! I've been studying these guns for years, and what I stated has been quite uniform in references on this matter.
Here is a quote from Wikipedia: After some research, DuPont came back to Remington with a compound they called Nylon Zytel-101. Zytel is DuPont's brand name for Nylon. This compound was ultimately used to produce the stock and receiver.[2] After the Nylon 66 proved to be successful, Remington also marketed a series of bolt action and lever action rifles using Nylon stocks.
That reference is based on the writings of Roy Marcot, a pillar of the Remington Association of America - (2)Marcot, Roy (August 27, 2009). "The Remington Nylon 66: A new concept in rifles, back then".
Here is more detailed information that I have collected over the years, much of it unpublished works by Remington Nylon collectors:
...DuPont went to work, and in amazingly short order, came up with a nylon formula that appeared to meet all the tough requirements. It was christened "Zytel 101." Unfortunately, the only colors Zytel came in were yellow, red, light blue, and black. Wayne Leek, R&D chief at Remington, experimented with mixing the colored batches, and came up with a proportional formula that came from the molds looking a lot like wood grain. It was the 66th formula tested... The gun was subsequently named the Nylon 66. It was named after that 66th experimental blend of specific nylon batches which finally produced a wood-like appearance.
Best,
John
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