Sumtoy Custom Incorporated Shotgun Red Dot Mounts - Tristar Viper G2 410 Contour

Sumtoy Custom Red Dot Mount Designed For Burris/Vortex Micro Red Dots. Sizing chart below indicates firearm fit:Size 1- Benelli 12 Ga ContourSize 2- Beretta 12 Ga A400 ContourSize 3- Remington 12 Ga ContourSize 4- O/U Shotgun with 5/16 Rib WidthSize 5- Benelli 20 Ga ContourSize 6- Remington 20 Ga ContourSize 7- Mossberg 835/935 ContourSize 8- Tristar Viper G2 410 ContourRequires gunsmith to drill and tap, unless shotgun came from the factory with holes to mount.