Round or flat rear receiver for fcxp3?

Greetings all! I am new to the forum, I just ordered my first savage, an FCXP3 package gun in .308. It comes with a scope but I'm planning on replacing the mounts and scope with a 1 piece picatinny rail mount and better scope. I'm already pretty much sold on getting the EGW 1 piece and some burris signature zee rings, but I'm having trouble figuring out if the rifle I ordered has round or flat rear receiver. Its non-accutrigger, and everything I've found says the basic rule is non-accutrigger = flat rear receiver, accutrigger = round. However in all the pictures I've found the receiver appears to be round and level with the front receiver top. I've also found a couple posts in different places where people who have this model seem to think that they have a round rear receiver. So is the FCXP3 like the stevens 200 and despite not having an accutrigger, it has a round rear receiver? Anyone who knows or has one I'd really appreciate if you could help me out with this. Thanks!

JZ