Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM-B-447728 found under Suppressor Parasitic by Mcguire Products Co. The National Stock Number assigned to this part is 5915009519888, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SM-B-447728.