Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 30-50-193-002 found under Eyepiece Assembly Optical Instru by Drs Rsta Inc. The National Stock Number assigned to this part is 6650015231686, 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 30-50-193-002.