I just went and blew 15k caps on the AMR and the mods for it, and now I can't mod it. The mods are in my inventory, but pressing X to select mods shows nothing.

So I read up on it and apparently there's a glitch on PC where you can't mod it (FML). Is there any way to fix it, or at least use console commands to mod the gun? I'm down 5k caps now.