I have an early Lee Six fiberglass stock I put on a Remington 721 in .280 Remington. I got it back in the late seventies or early eighties. Chet Brown had built a high country model for me on a Remington 600 action with a Shilen stainless barrel in .284 and his then new Kevlar riflestock. The Lee Six stock I have is not an injection molded stock but a laid up fiberglass stock. I don't think it is a particularly lightweight stock, but it's been so long ago since I put it together I don't recall it's weight.
One thing for sure it isn't near the featherweight Kevlar stock that Chet made for the model he called "High Country" which weighs in at under six pounds with a bushnell 2-8× compact scope aboard and when my eyes were better shot MOA with Winchester factory loads.