The old Rem Nylon 66's were very light but many had a serious problem with loose barrels. The barrels were held in the plastic stock with a shim instead of being threaded into the receiver. If the shim got loose, it was impossible to keep sighted in. I had one of those. I could sight it in to hit a dime at 50 yds, but 5 shots later it would be hitting 6" away.
