The MR is assembled in the USA, meeting the requirements of the Buy American Act, and is a GR1 mortise lock. The MR is interchangeable with Corbin mortise locks.
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The GT is assembled in the USA, meeting the requirements of the Buy American Act, and is a GR1 cylindrical lock.
The SW is a GR2 cylindrical lockset.
The SE is a GR2 tubular lock.