This guide details the installation and basic operation of the SureFire XC3 Sub weapon light, as demonstrated by Roger Barrera of QVO Tactical. It covers selecting the correct rail key for compatibility with various micro-compact pistols like the Sig Sauer P365 XL and Glock 48, and explains the intuitive momentary and constant-on activation. The XC3 Sub offers high lumen output and candela for tactical applications.
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