A new upper on a new LMT lower. second time shooting it. when i went to clean it for the second time i noticed this. I did a google and site search but i did not know what to look for so i had no luck.
http://i6.photobucket.com/albums/y22...gandbuffer.jpg
http://i6.photobucket.com/albums/y22...y/bcgflash.jpg
http://i6.photobucket.com/albums/y22...ferupclose.jpg