The other leg on the bolt is indeed to provide a force to keep the other leg against the hammer. When an uninstalled bolt is viewed from 'above', the two legs should be slightly apart from parallel, or 'splayed'.
If the bolt has not been worn or trimmed, and I submit that you may not be able to tell until you compare it with a new one, then the news is bad: the cam on the hammer is somehow too small, and the $11 will probably need to be spent.
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