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to clear the face of the receiver extension,
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OK, to be clear, so we are both talking about the same thing, the mag tube (and the action bar) have to move forward enough to clear the joint between the receiver and the receiver extension. They don't have to come out of the receiver extension.
I'll try and drag out one of my model 12s tomorrow and check but as I recall they use the same system of takedown, though the parts are not interchangeable.
Soak the receiver in a good penetrating oil for a few days (kroil, liquid wrench etc.) and see if that frees things up. IF not, there are other things to try, before going to the vice and wrench.
Also helps to turn it the correct direction,
And no, I don't currently recall which way that is, but my model 12 will remind me, when I get to it.