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You can either try to remake the wing from JB Weld Putty or Bondo Plastic Metal (something that can be moulded and sanded to perfection) or replace the part from the manufacturer or a site that sells that part.
The BB loading nub on my blowback cylinder broke in my M9 and I moulded the piece with metal and moulding putty. Works like a charm and I haven't had issues with it since.
Good luck.
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