Those with Black Arch Protos-M’s, are they optics ready? For a 43x MOS w/Holosun 507k

As the title says, are Black Arch’s Protos-M’s optics ready? Will be for a 43x MOS.If not, would it be possible to safely dremel the holster to make it optics-compatible? via /r/CCW https://ift.tt/2MQRaXM