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 ... that it could be blamed on caliper reading. Something like a 3/4" X 1" ...