Can anyone explain to me why some hammers are notched and some are rounded? I have two complete lowers, one I built and one I bought and have one of each hammer. Why the difference and does one work for some uppers and not others, etc. I'd appreciate the explanation. See photos:
The notched hammers get hung up on the firing pin when you have a unshrouded bolt carrier. This damages the firing pin retaining pin as well as the firing pin.
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