I 'think' it will be an MPR in an ultimate sporter stock. The MPR needs tweeks to make it work which i know AA looked into. Not sure if they will be side lver or rear bolt. Side lever would be nice though. I have been shooting my MPR in the US stock for a few months now & it is very nicely balanced imo.
In life you should not persue goals that are easily achieved, develop an instinct for what can be only just achieved through your greatest efforts.