The Cherenkov Telescope Array (CTA) is the next ground-based γ-ray
observatory in the TeV γ-ray spectral region operating with the Imaging
Atmospheric Cherenkov Technique. It is based on almost 70 telescopes of
different class diameters - LST, MST and SST of 23, 12, and 4 m, respectively -
to be installed in two sites in the two hemispheres (at La Palma, Canary
Islands, and near Paranal, Chile). Several thousands of reflecting mirror tiles
larger than 1 m2 will be produced for realizing the segmented primary
mirrors of a so large number of telescopes. Almost in parallel, the ASTRI
Mini-Array (MA) is being implemented in Tenerife (Canary Islands), composed of
nine 4 m diameter dual-mirror Cherenkov telescopes (very similar to the SSTs).
We completed the mirror production for all nine telescopes of the ASTRI MA and
two MST telescopes (400 segments in total) using the cold glass slumping
replication technology. The results related to the quality achieved with a so
large-scale production are presented, also discussing the adopted testing
methods and approaches. They will be very useful for the adoption and
optimization of the quality assurance process for the huge production (almost
3000 m2 of reflecting surface) of the MST and SST CTA telescopes