M4A1 is an obtainable Tactical Doll in the game.
The M4 carbine is a shorter and lighter variant of the M16A2 assault rifle. The M4 is a 5.56×45mm NATO, air-cooled, direct impingement gas-operated, magazine-fed carbine. It has a 14.5 in (370 mm) barrel and a telescoping stock.The M4 is capable of firing in semi-automatic and three-round burst (like the M16A2 and M16A4), while the M4A1 is capable of firing in semi-auto and full automatic (like the M16A1 and M16A3).The M4A1 carbine is a fully automatic variant of the basic M4 carbine intended for special operations use. The M4A1 has a "S-1-F" (safe/semi-automatic/fully automatic) trigger group, while the M4 has a "S-1-3" (safe/semi-automatic/3-round burst) trigger group. The M4A1 is used by almost all U.S special operation units including, but not limited to, Marine Force Recon, Army Rangers, Army Special Forces, Navy SEALs, United States Air Force Pararescue and Air Force Combat Control Teams. The M4A1 is especially favored by counter-terrorist and special forces units for close quarters combat and urban warfare because of the carbine's compact firepower. It has a maximum effective range of about 500 to 600 meters (550–660 yd).Conversion of M4s to the M4A1 began in 2014, the start of all U.S. Army forces being equipped with the automatic variant. Though in service with special forces, combat in Afghanistan showed the need for providing automatic suppression fires during fire and movement for regular soldiers. The 101st Airborne Division began fielding new-built M4A1s in 2012, and the U.S. 1st Infantry Division became the first unit to convert their M4s to M4A1-standard in May 2014.
|Acquisition||您就是指挥官吗，接下来的事，就拜托您了。||指揮官、よろしく…お願いします。||Are you the commander? I'll leave the rest to you.|
|稍微……有点痒……||ちょっと…くすぐったいです。||That...kind of tickles...|
|Secretary (post OATH)||
- She is the squad leader for the Anti-Rain Squad(Consists of M16A1,M4A1,M4 SOPMOD II and ST AR-15) in the story.
- She is soft spoken and having a conflicting personality, being shy yet strong at the same time. She's looking to change this and become a more capable leader.
- In her art you can see that she uses a straight 20 round magazine instead of the standard 30 round STANAG normally found on a M4A1.
- Quest Reward for clearing 2-6.