difference between SFIC & FSIC cylinders

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There are several ways to spot differences, see Figure 1, but the easiest is to look at the face of each core. The face of both cores looks like a "figure 8".  With small format, bo...
A zero bitted Falcon SFIC core is combinated for the control key to be cut at all 4's.
The Schlage B and BD cylinder suffixes designate less small format interchangeable core (SFIC) cylinder prep for the lock. Any SFIC, 6-pin or 7-pin, can be inserted into the lock and will operate t...
The Schlage SFIC rim cylinder driver is part number B520-365, shown below.     Figure 1: SFIC Rim Cylinder Housing