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I don't know the Knoxx Axiom stock specifically, but changing a Remington stock is usually just a matter of taking the stock screws out. These are located on the trigger guard and magazine floor plate assembly. Unscrew them and pop the gun into the new stock and put them back. Usually around a dozen to twenty inch-lbs of torque is used. If you don't have a torque wrench, just try to remember how hard they were to remove and reverse that going back in. If you have accuracy problems, try tightening them a little. Just don't strip the head slots.
If the stock has to be bedded, that is more complicated and you want to read up on that or have a gunsmith do it.
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