Well I bit the bullett and I got it to work, its not perfect, I think I could drill the hole a bit deeper, but not too much,
Does the barrel have one slot or two? Are you sure the twistlock assembly isn't so tight that it's not allowing it to rotate to the final click/lock position?
I think I need a good machinist to help me out there with that one. good idea, but I want my barrell to lock properly. Im wondering how hard it would