All of the handle scales are compatible with Generation 2, 3 and 4 XM-18 3.5″ that have a full liner. If you have a GEN 1 with a half liner, please contact us directly. Our XM-18 scales provide a secure grip no matter the environment, yet will not abrade your hands. They are fully CNC machined from nearly indestructible G10 laminate which is impact resistant; it is not affected by temperature or moisture, and is maintenance free. The XM-Texture helps to provide maximum knife control with a no slip grip perfect for all-weather operations and extreme conditions.,