I do have plans for an RMR version... i actually already have the specs from Trijicon and have it modeled for the 870. Right now some things have come up that focus is 100% on current products with next to no room for development (hopefully that'll change this fall).
The one developmental exception is the 1301 stock adapter. The optic mounts will be 100% machined tomorrow, so from there all the focus is on the stock adapter. It's moving in the right direction. Barring major hangups, the original goal of having it ready for pre-order by August or September seems pretty achievable.
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