I as well would be in for a CNC hop unit. The problem is even if you secure the outerbarrel into the hopup, the posts the barrel locks into seem to be very weak, so whatever improvement is required, I think it needs to start with a hopup chamber made of a harder material to match an upgraded outer barrel. The stock outer barrel is very soft as well, and if left in, but evensecured, the outerbarrel will eventually fracture instead of the potmetal hopup.