User blog comment:101stranger/Ah, the wonderful world of UNSC infantry weapons/@comment-138261-20100415110403

It wouldn't be possible to suppress magnetically accelerated weapons. For one, the munition is raping the sound barrier, so the gun would produce a epic amount of noise. For another, it's literally igniting the air around it via friction, so its going to produce a gout of flame out the front, no matter what.