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Mfg Item #: 91507
** FOR 0.169" LARGE PIN COLT LOWERS ONLY **
Colt is the only AR-15 rifle manufacturer to use both small and large diameter pins in their trigger groups. Most Colt AR-15 rifles manufactured before 1991 and after fall 2009 are probably small pins while rifles manufactured between 1991 and fall 2009 are probably large pins. Please verify before ordering.