large format ic core

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There are two parts that can be referred to as control pins for a 23-030 (FSIC core).C603-967 is the lower control pin that sits in the seventh hole of the FSIC plug. (part B in exploded view) ...
The "C" indicates small format IC core, which is the only core style Falcon products.  The C987 will be provided less core unless -6, or -7 suffix is specified (6 or 7 pin core) Example:...
The 23-030 is a Schlage Full size interchangeable core. 
It is not possible to key SFIC and standard cylinders including Schlage FSIC into the same system.  A keyway name may be shared between the two key fami...