This depends on how the gamertag field is set up. If it's going on a pixel width measurement, set avatars to that same width, but don't increase the height -- the standard post size (i.e. only one line or so of text) is fine, it doesn't need to be larger). If it's just fit in or on a percent measurement, don't change the avatars -- some people on different resolutions may not see the gamertag as wide as some others, so you'd just make the avatars wider than they should be.
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