M4/M4A1 carbine
M4/M4A1 carbine Caliber: 5.56 × 45mm M855 With the successful development of the M16A2 , the US military has also begun to consider developing a new carbine firing SS109/M885 bullets for special forces. Like the M16A2 , this new carbine was designed in 1983 based on the needs of the Marine Corps . At that time, the Marine Corps' Expeditionary Force was directly affiliated with the Reconnaissance Company (i.e. Force Recon , which in the past was always literally translated as "force" or "force". In fact, this refers to the "Marine Expeditionary Force (Marine Expeditionary Force)") . The only small shoulder-fired weapon officially issued was the M3A1 "greaser gun" (unofficially the XM177E2 ), and t...