This is the Glock 26 Gen 3 Pistol Frame and DIY Rail System by FreeMenDontAsk. The system relies on a DIY metal rail system which is added to a printed frame. Reference the G26 Front and Rear Rail ...
This is the result of several months of experimentation in order to have a base Glock platform that the gun community can design around ... and that is such tight measurement that it could be blamed ...