I picked up a partial Norinco M-305 and I can tell the barrel has been off before . The factory made 18.5 inch barrel and hooded gas lock front sight on the rifle now don't have Chinese threads so I am assuming the castle nut for the flash hider doesn't have Chinese threads either . I don't have a castle nut to try on it to confirm though. Previous owner had no info about it at all.
Where can I get a castle nut for the flash hider with GI threads ?
The SEI Hooded Gas Lock front sight looks like this except mine has OIF SEI stamped on it as well as USMC underneath those lettters

Where can I get a castle nut for the flash hider with GI threads ?
The SEI Hooded Gas Lock front sight looks like this except mine has OIF SEI stamped on it as well as USMC underneath those lettters

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