I have a question for the S&W MP 15 crowd. The barrel is marked 5.56 but i know that they are not always up to spec. How many of you have been shooting 5.56 through your S&W? Have there been any problems with the barrels? I have a good amount of 5.56 in the house and would like to get out soon and shoot it off. I know there are a good number of Smith owners out there, so I expect that the answers will vary, but lets hear them...

