The Knight's Armament URX 6 Toolkit includes the following:

119179 Gas Block Removal Tool
30897 Gas Block Wrench
115643 SR-15/SR-25 URX 6 Handguard Wrench
30447 Barrel Extension Wrench
30897 Gas Tube Retaining Nut Wrench
111530 Castle Nut Wrench
114660-1 SR-25 URX 6 Barrel Nut Wrench
114984-1 SR-15 URX 6 Barrel Nut Wrench
121458 SR-15/SR25 Muzzle Device Wrench