Since it doesn't sound like a chassis is your preference, what is the main draw of the AICS magazine for you? Capacity? Interchangeability with other rifles? Given the price of the Tikka chassis rifle compared to a standard Tikka and a seeming lack of preference for a chassis stock, it might make the most sense to buy a standard Tikka, see if you can live with the Tikka mags(they are well made) and if not add an aftermarket stock to accept the mag of your choice.