Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9-MP5-BSQ 4 found under Sight Bore Muzzle by L 3 Communications Eotech Inc. The National Stock Number assigned to this part is 4933014906677, 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 9-MP5-BSQ 4.