GoPro Mount for Gauge 12 barrel

This is a mount projected in order to mount a GoPro under the barrel of a semi-automatic gauge 12 rifle. The mount is adaptable
on many barrels of the same gauge, but is designed on the Beretta A400.

You can print the mount using PETG filament, with the following settings:
Rafts: NO
Supports: YES
Nozzle: 0.4mm
Resolution: 0.2mm
Infill: 20%

After the print is done, before mount the part on the barrel, you have to put a rubber on the circle that goes on the barrel, as shown in the pic below:
 

This rubber is useful to avoid barrel scratching and to increment the grip.