can i make control key for construction core

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A lock specified by a cylinder suffix BDC will be supplied with a disposable small format construction core, see Figure 1 below.  There is no metal key but instead the BDC cylinder has a ...
A small format disposable core is used as a SFIC construction core that is for low security applications and can be thrown in the waste bin after use.
For all Schlage and Falcon small format interchangeable cores shipped from the factory 0-bitted, the control key will be cut to all 4's.
The Schlage full size construction control key part number is 48-056-ICX.  The ICX suffix will change depending on if the key is for a new job or existing job.   New jobs: Specify "ICX"  E...
The lever may be missing the slot feature for the core locking lug.  Verify slot is in place.