Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MAG056-BLK found under by Magpul Industries Corp. The National Stock Number assigned to this part is 6135016210648, and the Federal Supply Class is 6135 Batteries Nonrechargeable. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MAG056-BLK.