G603 weight reduction project (with pictures and instructions) : r/MouseReview
Logitech G603 Lightspeed Wireless Gaming Mouse - Mouse Logitech G on LDLC
Logitech G603 Lightspeed Wireless Gaming Mouse : Logitech G603/G613 wireless gaming mouse and keyboard review: Is it possible to game without wires? - HardwareZone.com.sg
Logitech G G603 Lightspeed Wireless Gaming Mouse 910-005099 B&H
Logitech G305 vs Logitech G603: Which One is Worth Buying? - The Style Inspiration