Took my 556 out last Saturday. I have about 300 rounds in her and so far so good. Back home while I was cleaning it, I noticed that the spring on the firing pin became kind of loose and it extended forward and covered the recess on the firing pin (the other end of the spring is still attached to the end of the firing pin). I did the functional check and everything seemed normal. Is it normal that the spring would come "loose", or is it something to worry about? Your input is appreciated.