17. Remington Nylon 66
It's quite possible that our acceptance of synthetic stocks is due to a .22 rimfire autoloader that Remington first offered in 1959. It was called the Nylon 66 and had a stock made of a high-strength DuPont material called Zytel. It weighed only 4 pounds, held 14 rounds in a tubular magazine in the butt, and was offered in brown, black, or green. And it was unstoppable. I never cleaned mine and used it in 20-below temperatures, and it never failed me.
In 1959, over a period of 14 days, Remington's exhibition shooter Tom Frye shot at 100,010 wood blocks thrown into the air, using two Model 66s. He hit all but six and had no malfunctions. The Nylon 66 had a 41-year production run, and over a million were made.