Hi-Res.
The object in question is one of four darts contained in the bullet in this experimental bullet designed to improve the performance of what Kim du Toit calls the "9mm Euroweenie Pellet." The case is marked 9mm Luger. Well, actually, because it's cut in half, it's marked 9mm Lug. The darts are embedded in rubber.
Here is the cut-away with a standard Winchester 9mm, and here it is with an 8mm Mauser, just to keep you in scale.
So, those of you who argued for penetrator, or 'core' were correct, if you had a leetle teeny tiny scale problem.
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