Vector Optics Frenzy-X 1x20x28 red dotThis red dot uses the Docter footprint standard. 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 3MOA dot size with 8 Levels & 2 NV red dot intensity Weaver mount & compatible for VT footprint (can do TRI footprint too) >50,000 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