The M16A4 is briefly shown during the teaser video.
File:M16BF3Teaser.pngOne of the Marine on the top right is carrying what looks like an M16A4 during the briefing scene.
M4A1
The M4A1 is commonly seen in the teaser which is also in the hand of the main character.
File:M4BF3Teaser.pngSeveral Marines in the teaser can be seen clearing out a room with an M4.File:M4BF3Teaser02.pngThe M4A1 is clearly shown in the hand of the player as the Marines are about to perform an entry.File:M4BF3Teaser03.pngA tactical flashlight is attached to the main player M4A1 as the Marines are clearing out the alleyway. Notice the detailed lightnings in this scene.
