I have the 407/507k's, Vortex Defender and Cyelee Cat x-pro on my Dagger Micro slides and they all co-witness with stock sights. The EPS Carry I have on a Glock 43x that was milled by Battlewerx, and it also co-witnesses with the stock plastic Glock sights. The milled 43x slide looks about the same depth cut as the Micro Dagger slides, so I'm pretty confident any of the rmsc and k footprint optics will co-witness just fine.