AI used the same mould for all chassis back then. This is related to why the old AICS chassis had that square block around the bolt handle. The best way to neaten everything up after modifying AW skins for a Rem700 bolt handle was to just take a larger chunk out and implement the cosmetic square block. The block covered up the cheap cut marks that could be seen through the top. Any assumptions of it acting as an auxiliary lug for the bolt handle are not true - similar to speculations of the square AI design being a result of ingenuity to allow maximum rigidity or to use double stack/feed magazines etc! After all, Rem700 bolt handles are just braised on, so would quite easily snap off if the bolt lugs failed.
I almost won an auction for 4 sets of genuine G22A1 skins but was sniped in the last 10 seconds. They would have been very useful