I bought a new Nylon 66 in 1979. The first time out with it I fell on some rocky terrain and cracked the stock. The weather was below zero f that day, which may have had something to do with it breaking like that. Anyways, I sent it into Remington, and they replaced it with the rifle that I have have to this day. It still shoots and cycles as well as new after thousands of rounds through it.
