M4A1

"The M4A1 follows a modular design philosophy, and continues to improve on the foundation of M16A2's M4 variant as a carbine weapon. My primary use is in the arsenals of special forces. Although I've had a tumultuous adoption history, my light weight and close-range stopping power eventually let to my popularity on many battlefields. War is ever changing, right Commander?"

- M4A1

M4A1 is one of the major heroines and the central protagonist in the mobile video game, Girls Frontline. She is a T-Doll who served as the leader of the Anti-Rain Team and DEFY and was created

She was voiced by Tomatsu Haruka.

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Weapon background
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.