I just picked up a MPA chassis for my match rifle. I have some questions about the built in rail system. I have noticed several of the guys at matches have an Area 419 ARCA rail on their chassis. Does the rail that is on the chassis work with standard arca accessories or only the RAT accessories. I haven’t picked up any of the ARCA accessories yet but want to try to grab some Black Friday deals. If there is a good reason for running a different Arca Rail I will try to pick one up on sale as well.