Valpo Hawkeye
Flashlight Enthusiast
Take a look at this link. Found it in a google search of Surefire L4. It looks like some mini-mag reflectors with Lux 1 or 3 led's, but I'm not sure...
http://shindo-s.com/ending/photo_01/_28/0703_4261.jpg
http://shindo-s.com/ending/photo_01/_28/0703_4261.jpg