Which gun millermatic 200 funny connection?

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I just bought a mm200 a week ago.  The gun on it is a older style tweco and works fine but its only a 10' gun I'd like to have a 15' eventually.  A couple of people on here said to get a bernard q300 which is what we use at work problem is my connection looks different on the end of the gun.  It has like a tweco adapter thing on it and the gas goes into the adapter on the outside of the welder, anyways I've attached pics of the gun and adapter unplugged.  I just wanna be sure I get the right gun when I do order one.  I've attached the pic Attached Images
Reply:Unless thats a real early machine, I also own a white face MM200 and the gas connection is inside the machine on the wire feed assembly.
Reply:Not on this one it is the red tube in the middle of the picture on the adapter that sticks outside the machine there is nowhere near the drive motor where it could attach
Reply:Post up a pic of the inside of the cabinet. I wonder if the drive end has been replaced with one out of some other machine.
Reply:Heres a picture of it assembled so you can get a better idea of how the gas goes in. Attached Images
Reply:Thanks 7A749 Problem solved you were exactly right I found it.  Hard to see and hard to get to.