Soooo basically chest rig is not a good choice if the COF includes a prone shooting position.
Although I'm recommending a belt on general principles, using a vest prone is only a problem if a guy has a substantial gut. Otherwise you just rotate a bit, which you'll do anyway to get a good angle on the mag insertion, and your mags are available.
If you're thinking IPSC 3-gun, AFAIK you do only one gun at a time, so you don't need all 3 guns worth of gear on a belt at the same time. Different story with IDPA / ODPL, where you might do all three guns in one stage (I consider this poor form, but other COF designers disagree).





























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