That's a .315 tall sight. Can just barely see it right at the bottom of the DPP window. Taller would probably be better, but it all depends on what one's expectations are. You're gonna need a really tall rear sight to see over the top of the DPP housing, or you could use the DPP 'add-on' rear sight for the DPP.
Or, you could have a groove machined in the rear of the DPP, slop a little white paint in there and just 'dot the I'.