Hey guys. Looking to sell my modified M203. It is a G&P that I modified to fit onto a Mk18 Mod1 without having to use the qd version. This will work by gripping onto the barrel. I have also included the mounting hardware needed to install it on to your gun. Below I will show explain how it is done. If there are any questions, please don't hesitate to ask. First is to remove the bottom rail off of your MK18. This is done by removing the two screws on the back of the rail on the sides, and the two in front of those more towards the front. You do not need to remove the very front screws. Only loosen them. Next, put the barrel clamp that I include over the top of the barrel towards the front of the gun(see the second pic in the listing for a general area to put it.) Then slide the M203 onto the gun, starting from the back. It should fit right in. Then align the holes that I have drilled and tapped into the launcher into to the holes in the rail on the back. Also now is the time to align the holes in the front of the launcher to the holes in the barrel clamp. Now all that is needed to be done is for you to screw in all of the provided screws into place. Tighten them, but not to much. You don't want to strip anything. And you're done. I'm looking to get $75 shipped for this. No trades please. Dont even ask me. Thanks for checking it out!