M60 = POS. My cousin has one, and even he reluctantly agrees. So does the US military; the Marines have already replaced them with the old, reliable FN MAG-58 (M240G), and the Army is in the process of replacing their M60s with the M240B model. The MAG-58 is, essentially, the Browning BAR receiver flipped upside-down and fed from a belt. As the world has learned over the last 50 years, this gun WORKS.
Not to spoil your fun... [:)]
(How to make an M60 jam, reliably, every time? Simple: just say, "Get some!")
-Troy