Built in-house. Made from heat-treated alloy steel. 
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Fits Glock Models: 17, 19, 20, 21, 22, 23, 34, 33, 40, 41, and 45.
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Install instructions for The CNC Pros MOS adapter plate:  
1- Make sure the surfaces and threads are clean and free from debris. Apply a  light coat of oil or grease to the adapter  plate to prevent rusting.  
2- Loctite 222 (purple) is recommended. Absolutely under no circumstances should any red, green or blue thread  lockers be used.  
3- Put a drop of 222 on the internal threads
and on the thread's screws. 
4- Use the supplied 3mm screws
5- Very Important Note:  Use a reliable torque driver set 10-13 IN. LBS
6- Allow to cure for 24 hours.