User blog comment:Griever0311/Ask A Marine Part По-русски/@comment-3165670-20100324050951

Well, the M14 is a battle Rifle, unless you talking about the M14 EBR. The M21 is a DMR (Designated Marksman Rifle [I THINK, NOT SURE])

Well, the M21 can easily kill some one fast, and is relatively light-weight.

The Barrett M82A1 was designed is pierce things like walls, sandbags, some light tank armors. not for Enemy waving his hands out in the open.