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1st and 2nd gen screws do not interchange. 2nd and 3rd gens do.

The 1st gen housing screw is a 6x38, 2nd & 3rd gens are 6x40. Check you screw thread with a thread gauge to know for sure what you have. If you do indeed have 1st gen housing screws 6x38 that fit your 2nd gen barrel, most likely someone has screwed a 1st gen screw into your 2nd gen barrel stud and upset the threads. I doubt that the female stud was changed. You may be able to very carefully screw in a proper 6x40 screw with lubrication and upset the threads back again.
 
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