I bought a 2.00 Bravo 3X and a 2.00 Bravo 3 as a package, specs showed online that the lowers on the 1.81, 2.00, and 2.20 are the same and I can swap them out. I'm keeping the same upper on mine, I am looking to swap just the lowers. However if I can just swap the complete drive to a 2.00 Bravo...