about 1/2 of a demilled BAR Receiver, marked 'Krinks Naples Fl' and 'KRBAR002' on the right rear side of the receiver.  Not sure of the story on this, I got it mixed in with some demilled Group Industries parts. Saw cut through the ejection port and also through the charging handle slot and torch cut through the bolt lockup shoulder and buffer threads. Bolt rails are machined as one with the receiver!  Rear sight dovetail unmachined. Unfinished and rusty but shows the amazing machining skill that went into making this aftermarket BAR!  Krinks BARs are previously unknown as a BAR maker