The XM-18 3 inch is built to be taken apart and personalized, and this is where you will find the hardware made specifically for it. Every part here is cut for the 3 inch frame, so it drops into your knife without the fitment guesswork that comes from mixing sizes.
A complete kit is the easiest way to change the whole look of the knife at once, bundling the pivot screw, three scale screws, three handle nuts, three standoffs, and the lockbar stabilizer with its screw, all sized for the 3 inch model. Kits come in materials like brass, copper, and anodized titanium, so you can go subtle or make the hardware the centerpiece. Copper and brass will patina with time and handling, which many carriers prize for the character it adds.
If you would rather upgrade a piece at a time, individual scale screws, pivots, standoffs, and the lockbar stabilizer are available on their own, along with scales in finishes and materials suited to the 3 inch. This is the same customization that makes the XM-18 3 inch such a personal knife, and it is part of the wider range of Hinderer parts and accessories covering the rest of the lineup. Take your time with a proper tool on install and the finish stays flawless.