Liberty,
I think all you need to know is if your rifle has the accutrigger or not. It looks like they only have two options for the light weight one piece for savage rifles. with or without the accutrigger. So if it does have it order the on for the accutrigger if not get the one for the none accutrigger
Don't mean to step on toes here but the AXIS never had a choice of triggers.
It is the Edge renamed to Axis and they are and were only made with non-adjustable triggers (thought there are a few tricks to help them out a bit).
Any two piece base made for Savage round receivers will work such as Burris part # 410615 or any of the long action Savage one piece will work such as EGW part #: 41800.
If you have your heart set on Talley - part number for the Axis is PL0252725.
Midway should have all of them
Dan