WILL BEST SFIC FIT IN FALCON X-SERIES LOCK?

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ND locks can be extended up to 6" Extended Outside.  
Schlage does not have a stainless steel/non-ferrous lock series. The only option that Allegion provides is the Grade 1 cylindrical Falcon X-Series. To order the Falcon X with the stainless st...
The Falcon MA will not fit a 1-3/8" thick door. 
The B600 (standard cylinder only) can be be specified for 1 3/8" thin doors and the appropriate parts will be supplied.  Interchangeable cores are not available for 1 3/8" thin doors.
The outside housing, B600-089, can be ordered to retrofit an existing standard cylinder B600.Description: 1 1/8” Collar (trim ring) for 1 3/8” – 1 5/8” door
The L Series lock can fit into a door prepped for the SCHLAGE K Series with some additional prep as described here.  
K and L trim and parts are not interchangeable. 
Key in lever Falcon cylinders do not work in Schlage locks.  The cylinders may fit, but there are no specific tailpieces created to operate any Schlage lock. SFIC SFIC is universal so Falcon and...
   Hotel cylinder in L9000 As long as the correct cam is used (Schlage clover), a Falcon Hotel cylinder will properly function in an L9486 hotel lock.
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 B series accepts 6 or 7 pin small format cores when specifying with the "BD" cylinder suffix (less small format interchangeable core).  The tailpiece shown below is used for both...