Saying those "Tenite plastic stocks ... were not very strong or durable" is a whopping understatement. They broke almost at a touch and there are pieces scattered all over the country. That was a problem for Remington when they tried to market the Model 66 with the Nylon plastic stock. A whole different proposition, but people saw "plastic" and ran away in droves.
Plus, that gun with the side selector button was not very durable either; the selectors broke so routinely that when I was an active gunsmith I used to see the damned things in my sleep. We kept 30-40 on hand all the time. The newer model with the selector in the hammer was much better. One caution, don't dry fire that gun; dry-firing will break the selector if nothing else did first.