This red dot uses the Docter footprint standard.

Essential info

• Footprint standard: Docter footprint standard
• Reticle: 6 MOA dot [red]
• Window size [height x width]: 20.0 x 28.0 mm [0.79 x 1.10"]
• Total dimensions [length x width x height]: 46.0 x 32.0 x 35.0 mm [1.81 x 1.26 x 1.38"]

• The extra-large window size 20x28mm 0.8x1.1”. You will see more
• 6061-T6 aluminum housing in rug construction light weight 56g 2.0oz
• 6MOA dot size with 8 Levels & 2 NV red dot intensity
• Weaver mount & compatible for VT footprint (can do TRI footprint too)
• >40,000 hours for NV dot & >20,000 hours for weakest visible dot
• IPX6 water proof up to 1 meter depth for 30 minutes
• Take 9mm, 45ACP, 12GA and Lapua Magnum 338 Recoil
• Clear lens with premier and protective coatings
• On/off switches on side, complete user control and 4 hours auto shut-down