|Full name||United States Submachine Gun, Cal. .45, M3|
|Voice actor||Yamane Nozomi|
M3 is an obtainable Tactical Doll in the game.
The M3 was an automatic, air-cooled blowback-operated weapon that fired from an open bolt. The M3 was chambered for the same .45 round fired by the Thompson submachine gun, but was cheaper to produce, and lighter, although contrary to popular belief it was far less accurate. Constructed of plain .060-in. thick sheet steel, the M3 receiver was stamped in two halves that were then welded together. The M3 was striker-fired, with a fixed firing pin contained inside the bolt. The bolt was drilled longitudinally to support two parallel guide rods, upon which were mounted twin return (recoil) springs. This configuration allowed for larger machining tolerances while providing operating clearance in the event of dust, sand, or mud ingress. The M3 featured a spring-loaded extractor which was housed inside the bolt head, while the ejector was located in the trigger group. Like the British Sten, time and expense was saved by cold-swaging the M3's barrel.
|Acquisition||您，您好，长官，我是....M3冲锋枪......||こ、こんにちは!M3といいます。よ、よろしくお願いします!||He-hello, commander, I'm.... M3 submachine gun.......|
|Secretary||注……注油枪！？不会是在说我吧？？||.グ、グ、グリースガン?私のことじゃないよね?||G-grease gun? You aren't talking about me, are you?|
|射击速度不行吗？没办法，这就是性价比嘛……||発射速度が微妙ですって?コストの問題で仕方ないですよ!||My rate of fire isn't high enough? I can't do anything about it, it's cost-efficiency, after all...|
|指挥官，薪水还没发吗？这个月又快没钱了呀……||指揮官、お給料…まだですか。今月の生活が厳しいかも。||Commander, is it pay-day yet? I'm almost out of money for the month.......|
|Secretary (post OATH)||
Sorry, did I disturb you? I'll be over here... Just kidding, since we have a contract, I won't leave you no matter what.
Commander, can I help you with something? Are you trying to trick me? Eh? What's this? For me? ...Giving this to someone like me? Really... I'm so happy...
|Joining an echelon|
|Starting a combat mission|
|Starting a battle|
|Halloween||南、南瓜头的怪物真的会出来吗？！指挥官，不要吓唬人家啊！||あ、カボチャ頭のお化けは出ませんよね…、ひぃ！指揮官、嚇かさないでください…||J-Jack O' Lanterns will really come out?! Commander, don't scare me like that!|
|New Year's Day||
- Nicknamed the Grease Gun due to it's visual similarity to the tool.