You are able to put a Holosun 407k/507k on it with CHPWS adapter plate. The screws that come with the plate will probably require submitting to receive them good on length and it is best to disassemble the slide and dry suit every thing to verify the extractor aspect screw https://messiahkoonh.blogdanica.com/18400857/glock-43x-mos-frame-an-overview