I made the title what it is just to get views because this is mind boggling. I have a mutation X v4 and an Diablo abbadon mod. The mutation will not screw the entire way down on the mod, fire pin is all the way down on both ends. Every other rda I have fits on the abbadon mod, screws in perfectly. The mutation fits on all my other mods. Yet, together. They won't work? I bought it for my girlfriend as a gift. I've done every kind of combination I can think of to fix it. Thoughts?