It really is the only place you can put it and give it a proper arch of fire.
You're likely to see an HMG there as well.
Also, as this picture shows, the rear edge of the bridge should be black all the way down.
And here's a better and more recent one.
If you haven't seen it before,
MAB has a great number of pictures of the class.
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That which does not kill me has made a grave tactical error
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