Night Fision Optics Ready Sights for P320 For lower 1/3rd co-witness with Norsso optic cut slides, the 345-332 blade height version is required (except for the Deltapoint Pro cut). The 167-165 blade height set will not co-witness with any optic cut and is an OEM height set best used with... MSRP: Was: Now: $114.00 Choose Options