These sights are drop-in in Mark III/IIIS Hi-Powers only: Front & Rear Dovetails used by FN/Browning 1989 – 2017. Also used by FM on the FM95 and FM95 Detective and some Arcus 94 models. The MKIII Sights are Press-Out / Press-In for all MKIII Sight cuts. We can dovetail all slides (except Tisas BR9 and Springfield SA-35 slides) to accept MKIII sights.
Ask your BHService Coordinator for details at 1-877-423-BHSS(2477)