Which of the following statements is true regarding the M27 Infantry Automatic Rifle?

The statement regarding the M27 Infantry Automatic Rifle being magazine-fed and firing the same ammunition as the M16 / M4 is accurate. The M27 utilizes 5.56x45mm NATO ammunition, which is standard for both the M16 and M4 rifles. This compatibility allows for logistical efficiencies, as troops can use the same types of ammunition across different weapon systems, simplifying supply and maintenance processes on the battlefield.

In contrast, while the M27 does have impressive characteristics when it comes to rate of fire and effective range, it doesn't maintain the specified sustained rate of 85 rounds per minute. Additionally, its maximum effective range against a point target is generally cited as being around 550 meters, not 800 meters, which would be more applicable to the M240 machine gun. Furthermore, the M27 was not adopted by the Marine Corps in 1985; it was officially adopted much later, in 2017, as a modern replacement for the M249 Squad Automatic Weapon in certain roles. These elements highlight the importance of accurate weapon specifications in the context of military operations.