Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 171 0500 000 042 found under Training Set Firing Range by Theissen Training Systems Inc. The National Stock Number assigned to this part is 6920016707278, 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 171 0500 000 042.