As popular as the C9 comp is, people love em, i think bemiller should sell a comp conversion kit. The barrel is 2 pins to remove, and the compensator attaches sith a hex head. There is no other difference in the firearms besides that. for those not comfortable with the swap, a gunsmith could easily do it. i would not suggest bemiller do it, they are busy enough. My buddy would kill for a comp, and for as many questions as we answer about it, i think people would pay to make it a comp.