what replaces g lock

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The G-Series lockset was discontinued in 1981, and all service parts for the G-Series lock were discontinued in 1985. 
 The current interconnect lock, S200 series (available in levers only), will not fit into the same door preparation.
Schlage G Series template locate here.
The old D series lever lock was replaced by the ND lock in September 2003.
The Falcon W-series lock has replaced the Falcon F-series and the Falcon Y-series.
  Falcon strives to provide a solid product, with solid performance, at a solid price. To better align with this mission statement the Grade 2 tubular Falcon Y lock and all parts will be...
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. 
  Issue: One or both levers don't stay horizontal and droop down.   Facts: Falcon T series locks in a high use application.   Cause: Weak or broken springs within t...
On power-up the CO-Series locksets will provide 5 quick RED Schlage Button flashes and 5 quick beeps to indicate that the electronics (credential reader) has been changed.  In order to recover...
When/If the electronics (Credential Reader) changed on a CO-Series lockset, the lock will respond with 3 RED Schlage button flashes and 3 beeps for any key press or credential presentation.&nb...
CO Reader Modules cannot be replaced by Reader Modules with a different credential type; for example, a magnetic swipe credential reader cannot be replaced with a proximity credential rea...
A Credential Reader MAY be replaced with another Credential Reader of the same type; however, a Factory Default Reset must be performed before the lock will function properly.
The process to change the Credential Reader on an AD-Series lock is as follows: Note: To ensure firmware compatibility of the lock and reader, it is important that the firmware in the LOCK and the...