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by Toad, from IA, United States Asked on April 15, 2022
From what information I could find the Foxtrot Mike FM-9 uses a proprietary barrel nut and handguard that lock into a cutout in the top of the upper receiver. Because of this design the Aero Precision AR15 Quantum M-LOK Handguard will probably not work. I recommend contacting Foxtrot Mike in regards to aftermarket handguard compatibility with the FM-9.