The hold open will only cause trouble if it is too hard. To remove it simply pull up and out, it will not hurt your gun to fire it without the hold open in place. Early guns did not even have them. Serial number on the firing pin is located just foward of the sear lug. If this is a commercial gun it will usually be blank.
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Suppose you were an idiot.....and suppose you were a member of Congress.....But I repeat myself" ~~ Mark Twain
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