I am trying to figure out the same thing! I just picked up an MPA competition chassis, it comes with rails and such but I'd like the little nipple a Harris usually attaches to. I like the ability to quick disconnect the bipod, for the moment I'll probably use one of my accushot bipods but for doing comp work I like the Harris better. There's the badger low profile module that replaces the cant module, it attaches via hex screws but you would need to have a tool to remove it. ADM has a QD module that attaches between the nipple connector on the Harris and a pic rail, but it adds a lot of space between the bipod and a rail.