As we've covered here before, Savage's AICS bottom metal differs significantly from the standard bottom metal in terms of the inlet required. The AICS bottom metal in present state can only be used on rifles that feature the AccuStock and accompanying shorter recoil lug that coincides with it. This is because the inlet for the AICS bottom metal is flat and deeper than the standard bottom metal and if you try to inlet a stock for both a standard (long) recoil lug and the AICS bottom metal the two pockets will intersect creating a weak point in the stock.