The ICE P320s do not have an optics cut. The DOD spec’ed the DPP foot print. CBP spec’ed that the rear sight could not be on the optics cut (which is how the M17 and prior X series were) and that it be capable of using the DPP and RMR. I’m guessing there is and adaptor for putting an RMR on the DPP cut. If I recall correctly the DPP footprint is slightly larger than the RMR foot print so it make sense to do it that way vs the reverse. The real question is can you put an ACCRO on it ?