Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M143GR found under Microphone Magnetic by Joint Electronics Type Designation. The National Stock Number assigned to this part is 5965001023803, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M143GR.