It seems to be just nylon reinforced with fiberglass.
This is a discussion on glass -filled nylon??? within the General Firearm Discussion forums, part of the Related Topics category; how come some handguns say they are made with glass-filled nylon, what does that mean and is it actually made with some glass? is it ...
how come some handguns say they are made with glass-filled nylon, what does that mean and is it actually made with some glass? is it any different than plane polymer?
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I do not know much about it, but I have read that it is a stiff and very wear resistant type of plastic. It is not made with glass, it is reinforced with glass-fiber, which makes it very rigid.
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You know...that's a good question. Actually, the terms and definitions seem to change almost as fast as the technology evolves. That often times creates confusion that brings us about to the question you've asked. Interesting to note.......I've never really had much concern over the differences in polymer, nylon, reinforced, fiberglass, glass filled, or composite as it might relate to stability and durability. Today's firearm stocks are at the cutting edge of technology no doubt. In a way....and as a practicing gunsmith, I don't ever see solid wood stocks being replaced totally. But plastics and most composites are the wave of the future and a combination of engineering and cost effectiveness. I'll say they are more stable for the most part. I have plenty of my own to know what's best in each and every one. The wood laminates, the solid wood stocks, the kevlar composites, the fiberglass reinforced, the polymer...etc. What's the best? Your guess is as good as mine. Thing is, I'd guess the glass filled nylon is low tech these days. That's not to say it's inferior in any way to what's currently available. As stated in previous replies, fiberglass reinforced nylon. Old school in my book but still strong. I'm going to leave you with some links for the plastics department.
Extensive reading I know.
Semper Fi by the way, and I love your avatar and the Chihuahua next to the pistol. I remember mine when she slept in my shoe and I could take her anywhere in my t-shirt pocket. Tea cup. I'll always remember her.
There was a .22 LR rifle by Remington years ago where the stock was made from this material. I believe it was their model 66. They seemed to be very good sellers and very high quality rifles. From everything I have seen and read about them I wish I had one in my collection.