Whenever I see a hammer that looks a little different than original, I always check it for "push-off". Some people like to lighten the trigger pull, and it is very easy to go too far. Just cock the hammer back, and see if you can fairly easily push it forward with the heel of your hand. This is without touching the trigger. It should stay latched up. If it goes forward real easy, it could possibly be a safety issue. Your call. Let's hope all of that hasn't been tinkered with.