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well i have a 7jp4 that was rebuilt at some time because the neck with the gun , the glass is a different diameter then the rest of the neck on the tube it self. so it was done and i would assume there were guns out there at one time. the tube i have i can clearly see where the two were joined together, infact i posted a pic of the tube and steve from ETM commented that maybe after all they can be rebuilt. but nos guns are needed or to rebuild the bad ones.
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