I Upgraded My Daddy's Old Surefire 6P - Malkoff M61 LED Conversion - YouTube
SureFire 9P Original Black Ultra High-Output Incandescent Flashlight 9P-BK
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Super Bright White Light and Red Light Replacement Led Bulb Bundle, Single Mode P60 LED Drop-in Module for Surefire C2 G2 6P 9P Flashlight - - Amazon.com