Moskov is such an absurdly strong marksman in ML that no matter how good you're winning, if an enemy Moskov reaches late game, the chances of you ending the game easily quickly turn to ashes.

JAR-5 Dominator isn't technically a marksman rifle but offers high damage, precision, and explosive rounds. Arrowhead's Helldivers 2 launched with only a few weapons, but this lineup quickly expanded.