Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R-3 GRAY found under Mount Resilient Weapon System by Vibration Mountings And Controls Inc. The National Stock Number assigned to this part is 5342014333289, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R-3 GRAY.