This is for milling of the Glock MOS 43x/48 version slides ONLY. This upgrade will allow for direct mounting of Holosun 407k/507k/EPS/EPS Carry or Trijicon RMRcc** optics without the use of an adapter plate over the existing optics cut. For NON-MOS Glock 43x / 48 milling click here.  **Upgrading to the Trijicon RMRcc footprint is an additional $40 due to the increased amount of milling required compared to the Holosun 407k/507k/EPS/EPS Carry. Lead Times: 4 Weeks or less or your next milling is FREE! The clock starts the day we receive your slide.  The clock stops the moment we contact you to let you know your slide is done and ready to ship. We will not ship your slide until we have verified from you that your shipping address is correct. Excludes slides that require Black Nitride (we don’t do this in house) Excludes slides that require custom new BUIS sights or optics that are on backorder (we don’t make them and can’t control lead times) Welcome to the #boomsquad! Shipping instructions will be provided after your purchase.