Accu-Stock has an aluminum stiffener to eliminate the flex in the normal Tupperware stock on the cheaper models.
I have three of Accu-Stocks and they all perform well.
I have 6.5mm CMs and .308s and don't notice any flexing in the Accu-Stocks.
I have a 10T-SR in 6.5mm CM and have no problems with it.
I have three other Savages that came with the normal Tupperware stocks and I eventually replaced them because the stocks flex in the larger calibers.
In a .223, the normal Tupperware stock doesn't flex enough to notice, but in the heavier calibers, they do.
Even the larger caliber rifles with Tupperware stocks shot great of of the box, but they improved a bit (about 10% in average group size) with stocks with an aluminum stiffener or in an aluminum chassis.
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