Where are you located that you have to be LEO/Military to purchase an MP15?
As far as the internals go, I am not sure what year yours was made but I had some issues with my chamber, and my gun went back to SW to be reamed out to 5.56. I also upgraded the spring on the ejector, and put an H-Buffer into it. Other then some crappy Romanian surplus ammo I haven't had a failure since.
Mobocracy is alive and well in America.*
*Supporting Evidence for Hypothesis: The Internet
-me
'All of my firearms have 4 military features, a barrel, a trigger, a hammer, and a stock."
-coworker
Bookmarks