This is for milling of the optics-ready Glock MOS 43x/48 Shipping Instructions for Your Slide Customization: Remove the slide from your pistol. If you selected "disassembled", remove all internals and iron sights Include a copy of your order confirmation or a note with your name, phone, email, and order number. Sending your optic is strongly recommended - it ensures perfect fitment, and we'll mount it for free. Use a sturdy box. Do NOT use envelopes. Ship your slide using any major carrier: UPS, FedEx. WE STRONGLY DISCOURAGE discourage using USPS due to lost shipments and lack of tracking. Send your package to: CHPWS - "ATTN: Slide Milling" 55 Mustang Ct. Richmond Hill GA 31324 Questions? - Call us 912-445-5803 Click here to browse all of our Red Dot Adapter Plates. Click here to browse all of our Slide Milling Services. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols. THIS PRODUCT HAS BEEN MODIFIED BY C&H PRECISION WEAPONS LLC C&H Guarantee If there is ever a problem with your pistol slide due to milling work done by us, we will do whatever we can to fix the issue, up to replacing the slide.