All slides are evaluated when they arrive to determine that an optics cut can be safely milled into the slide.  If we determine your slide cannot be upgraded, we'll send it back to you at no charge and issue a complete refund. Any 2011/1911/STI series 80 slide that has a safety plunger/firing pin block CANNOT be milled for any optic or adapter plate due to the cut going into the safety plunger/firing pin block cavity. The only exception is the Lionheart Regulus due to the cavity for the firing pin block not extending into the cut area. We cannot mill any .22 caliber 1911 slides.   **The CHPWS EDC-RMSc, Holosun 407K / 507k/EPS, Shield RMSc, Sig RomeoZero/RomeoZero Elite/RomeoX Compact (Romeo Zero Pro and R cannot be direct milled) and Trijicon RMRcc can be direct milled to your slide without an adapter plate.  All other optics must be mounted with the CHPWS cross plate. **Both direct mill and CHPWS cross optic plate adapter cuts require the rear dovetail to be milled away. Most CHPWS cross plates incorporate a built in back up iron sight. ** Most 1911/2011/STI slides are milled to the depth of the base of the rear sight dovetail or BOMAR cut. Slides with a shallow rear sight dovetail or no dovetail are milled to a depth of .200" from the top of the slide if possible. This is to ensure the cut is flat and screw holes are milled properly. For slides with a deep dovetail this can mean some thinner base direct mount optics may have the bottom of the window slightly below the top of the slide and make optic integrated rear sights sit too low to be usable with stock front sights. Lead Times: 4 Weeks or less or your next milling is FREE! Clock starts the day we receive your slide.  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.