Why is the Barrett .50 different on bad company 2 and modern warfare 2?

Just wondering because it's the same rifle and on bad company 2 it has to be ****** before each shot and on modern warfare 2 it is semi automatic. Thanks.Why is the Barrett .50 different on bad company 2 and modern warfare 2?
mw2 barrett 50 cal is more thought out because mw2 is a more advanced game than bad company 2 is.Why is the Barrett .50 different on bad company 2 and modern warfare 2?
different games with have the same weapon, just different to meet the needs of that video game.

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