I just got my replacement Invader for the one that was DOA Saturday a week ago. I have used it a couple of hours now and so far I love it, I don't think I will have problems with the top ring as long as I don't torque the tank down too tight. I did notice that the screen and board functions are nearly identical to my new Sig 75. Except Sig doesn't ask me if it's a new coil and does not allow screen to flip. I do like the Invader though almost as well as I like my new Sig 
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