Bit slow to reply here, while typing my last a number of posts were made.
The parts are listed, but still on the M4. After discussing this issue with Gump, our local Armalite Gun tech, and scarecrow the gun was put in its case and left there, and I haven't actively been selling the M203 at this time. It is still attached to the M4. Once J-Air told me not to expect any money from him to fix the M4, I looked for ways to do it within my budget and posted the M203. I decided to go public with this because of the treatment and overall tone of the deal.
Maybe you'll find someone else to help you. Maybe black mesa... THAT WAS A JOKE, ha ha, fat chance.
My Buy/Sell 1337ness rating