Go into a private match on MW2 or black ops. Use the FAL.
Make sure you have fresh, new AA batteries. Read below, and if something doesn't work, tell me.
Press RT1 to change pages.
Page 1 - RED.
Hold RT to rapid-fire.
Page 2 - GREEN.
Hold RT to rapid-fire.
Page 3 - BLUE.
Toggle Rapidfire with the LT1.
1 LED should turn on - blue color. I believe it is LED 2-4. Most likely 4.
Page 4 - YELLOW.
Toggle Rapidfire with the LT1.
1 LED should turn on - yellow color. I believe it is LED 2-4. Most likely 4.
Page 5 - PINK/PURPLE
HOLD LT2 to rapid-fire. No RT on this page.
Let me know what works, what doesn't so I can go from there.