BUIS for PDP with ACRO

I am looking for back up iron sights to co-witness with my PDP and Aimpoint ACRO P2 when it comes out. My question is to those who have the PDP and ACRO P1 - which sights did you go with and how low do they sit in the window? I do not want absolute or even lower 1/3 co-witness. I'm looking lower 1/6 or even 1/8 aka "low-witness". Any recommendations would be appreciated. Thanks! via /r/CCW https://ift.tt/3mdK7WG