The stock on the ADL is fairly sturdy compared to many I've seen. The main problem with chea..inexpensive synthetic stocks comes into play in the forend. There is no torsional rigidity in them, you can simply twist it with your hands and it will contact the barrel on either side of the channel. Some are made to work with a little tip pressure on the barrel, put some sling pressure on the stock, and there will no longer be any tip pressure. Another problem can come in the bedding area, if the stock is not properly bedded, and of insufficiently durable material, the recoil lug will not have a consisten area to work against.
I've only got three rifles with synthetic stocks, but the one with a McMillan is the only one that hasn't given me trouble. I've got a Mk V in .340 that was a stock nightmare up until the day it was removed and replaced. No amount of bedding or attempts at firming up the forend came to any good end with the factory stock. I don't call them spongy, I use the term tupperware and feel it is fitting for most factory stocks on rifles under $1K.
There is certainly a huge difference between most of the injection moulded stocks and the hand laid models, not the least of which is price. I guess it's a matter of getting what you pay for to a large degree.
