The M4 is a modified Ops Inc. 3rd Model that adds a 5.56 baffle stack and keeps the direct thread 1st section. The M4 was designed directly thread onto a 14.5? M4 Carbine with the simple instillation of a 3-piece collar that interfaces with the front sight block.

The M4 suppressor was notably used by MSG. Gary Gordon during The Battle of Mogadishu. This event was depicted in the 2001 movie Black Hawk Down.