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Hi Brendan and welcome. The Arex Zero 1 T & TC use a proprietary cut slide and then gives you 4 mounting plates to choose from. The RMR is most popular. This guide will help you pick the best Red/Green Dot for your needs: https://freedomgorilla.com/blogs/news/best-arex-zero-1-tactical-tactical-compact-holosun-optics-red-green-dot-sights-how-to-mount
What optics footprint is the Arex Zero 1 Tactical? The Arex Zero 1 T & TC use a proprietary cut slide and then gives you 4 mounting plates to choose from. For the optics we'll be recommending you will want to use the Trijicon plate. This will give you an RMR footprint.
