I wouldnt worry about the firing pin, I have never heard of one breaking. I replaced my Mil Spec with this Mainspring Housing http://www.midwayusa.com/viewProduct...tnumber=127124 which includes everything you need, and should drop in with no fitting.
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"No man for any considerable period can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true." Nathaniel Hawthorne
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