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Gunsmithing Removing a broken neck from an AR15.

With a .22 cal bronze bore brush on the end of a cleaning rod, break your A/R down for cleaning and run the brush into the chamber and slightly into the bore, then retract. The brush should grip the piece of brass neck and pull it out when you retrieve the rod.
 
Sized case chambered behind it sometimes grabs it to pull out, it worked in my M16A1 with a case separation (Automatically)
Cleaning brush trick works sometimes.
Broken shell extractor