| MMMac Machine, LLC | Pauls Valley | OK | — | ◇ UNVERIFIED |
| MIMagblock, INC. | Enterprise | AL | — | ◇ UNVERIFIED |
| MTMaine Tool & Machine LLC | Lisbon Falls | ME | — | ◇ UNVERIFIED |
| MIMango INC. | Los Angeles | CA | — | ◇ UNVERIFIED |
| MBMaria Barath Dba Danworth Manufacturing CO | Hayward | CA | — | ◇ UNVERIFIED |
| MMMarini Manufacturing, Inc. | Racine | WI | — | ◇ UNVERIFIED |
| MFMarlin Firearms CO | North Haven | CT | — | ◇ UNVERIFIED |
| MMMarshall Manufacturing Company | Minneapolis | MN | — | ◇ UNVERIFIED |
| MTMast Technology | Independence | MO | — | ◇ UNVERIFIED |
| MAMcalester Army Ammunition Plant | Fort Leonard Wood | MO | — | ◇ UNVERIFIED |
| MPM&c Precision Machining INC | Hawthorne | CA | — | ◇ UNVERIFIED |
| MCMcwhorter Custom Rifles, INC. | Doerun | GA | — | ◇ UNVERIFIED |
| MPM&D Precision Machining, Inc. | Garden Grove | CA | — | ◇ UNVERIFIED |
| MDM & D Supplies, INC. | Gilman | IL | — | ◇ UNVERIFIED |
| MSMeaden Screw Products CO | Burr Ridge | IL | — | ◇ UNVERIFIED |
| MTMeca & Technology Machine INC | Green Bay | WI | — | ◇ UNVERIFIED |
| MAMechanical Assemblers INC | Hood River | OR | — | ◇ UNVERIFIED |
| MAMedtronic Ave | Santa Rosa | CA | — | ◇ UNVERIFIED |
| MAMedtronic Ave | Windsor | CA | — | ◇ UNVERIFIED |
| MTMeggit Training Systems | Suwanee | GA | — | ◇ UNVERIFIED |
| MDMeridian Defense Group CORP | Goleta | CA | — | ◇ UNVERIFIED |
| MSMetal Seal & Products, INC. (0243161213) | Willoughby | OH | — | ◇ UNVERIFIED |
| MMMetric Machining INC | Riverside | CA | — | ◇ UNVERIFIED |
| MRMGC Real Estate, LLC | Hudson | MI | — | ◇ UNVERIFIED |
| MEMicrodynamic Engineering LLC | Livonia | MI | — | ◇ UNVERIFIED |
| MMMicro Machine and Design, INC. | Lebanon | PA | — | ◇ UNVERIFIED |
| MMMicromatics Machine CO | Hollis | NH | — | ◇ UNVERIFIED |
| MAMicroport Aston Properties, LLC | Irvine | CA | — | ◇ UNVERIFIED |
| MTMicro Thread Corporation | Chicago | IL | — | ◇ UNVERIFIED |
| MIMictron INC | Sarasota | FL | — | ◇ UNVERIFIED |
| MAMidwest Ammunition LLC | Hamilton | OH | — | ◇ UNVERIFIED |
| MAMidwest Automatic Products, INC. | Melrose | MN | — | ◇ UNVERIFIED |
| MSMidwest Screw Products INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MMMikco Manufacturing Technology, INC. | Wallingford | CT | — | ◇ UNVERIFIED |
| MTMike Tran and Yen Kim Ta, as Trustees of the Tran Family Trust | San Jose | CA | — | ◇ UNVERIFIED |
| MMilacron | Mcpherson | KS | — | ◇ UNVERIFIED |
| MAMilford Automatics INC | Milford | CT | — | ◇ UNVERIFIED |
| MUMinova USA INC. | Proctorville | OH | — | ◇ UNVERIFIED |
| MMMinowitz Mfg CO | Roseville | MI | — | ◇ UNVERIFIED |
| MKM K Chambers Co-north Branch | North Branch | MI | — | ◇ UNVERIFIED |
| MIMkt Innovations | Placentia | CA | — | ◇ UNVERIFIED |
| MBMonarch Bullet | Rochester | WA | — | ◇ UNVERIFIED |
| MAMontana Armory, INC. | Big Timber | MT | — | ◇ UNVERIFIED |
| MFMontana Firearms Group | Kalispell | MT | — | ◇ UNVERIFIED |
| MFMontana Firearms Group, Inc. | Kalispell | MT | — | ◇ UNVERIFIED |
| MGMontana Gold Bullets | Kalispell | MT | — | ◇ UNVERIFIED |
| MRMontana Rifle Company | Kalispell | MT | — | ◇ UNVERIFIED |
| MBMorgan Bronze Products INC | Wauconda | IL | — | ◇ UNVERIFIED |
| MIMotek-team Industries INC | Cambridge | MN | — | ◇ UNVERIFIED |
| MEM&r Engineering CO Dba S&h Glenco Manufacturing | Ontario | CA | — | ◇ UNVERIFIED |