well, that holds true on both sides. They aren't going to argue they are jsut gioing to give the standard gun. And you aren't going to argue, if you think it is the wrong gun you are going to provide something different.
However, what you fail to consider is that they may have a list of what they find acceptable, or may have a few options for her to choose from, or maybe they only have one choice, but it turns out it is actually a good choice for a wide variety of body types.
The least you can do is FIND OUT, and then choose to do what you need to do. Who knows, maybe the are issuing special short barrled browning BAR rifle in 308
