Are you sure it's bent? It would have had to receive a good lick with the mag out to get bent that way and there would almost certainly be some marks on the front of the trigger bow. Maybe it's just the way the magazine locks up? Looking at mine, 3 no.4's and a no.5, they all have different gaps/angles between the bow and magazine. If it is indeed bent I don't think you'll break it trying to straighten it out but getting it to bend back in the right place might be a problem.
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