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In the description said "20mm and 80mm spacing so will work with both M-Lokk and Keymod", I'm guessing I misunderstood the 80mm as a keymod/m-lok related measure, now that you mention it it's most likely the length of the rail cover and if the spacing is 20mm should do the trick nicely.

I'll make sure to try it out :D

Regarding support or printing direction, any advise?