While looking inside my lower, I've noticed a "ridge" or "crack" along the entire length of the disconnector. If looking at the picture, it is closer to the left hand side. Anybody know what this is or fifty it's something that needs to be replaced? Could have been there the entire time, only 1000rds. on this lower.


http://s7.postimg.org/5r6rwtfyy/CAM00030.jpg