SIGMECH SIG Sauer P365 Tungsten Heavy Guide Rod - FUSECOMPATIBILITY: P365 FUSE PACKAGE ALSO INCLUDES 1x BUFFER RING Designed for heavy duty use, SIGMECH Tungsten Heavy Alloy (WHA) guide rods are over engineered to perform and exceed expected mechanical use. Each SIGMECH WHA guide rod is precision ground to tight tolerances using specially selected US sourced, high grade tungsten that is then finished with a high polish, low friction surface for extremely smooth cycling and excellent wear resistance that