I have the LM4 and love it. Only mod I had to do was open the return spring hole a bit on the nozzle. Other than that it's been a great gun and yes the Pmags are easier to work on.
http://youtu.be/huew-nRKgSE?list=UUZ...M8lca3Omyzj0XA
https://www.youtube.com/watch?v=VjOK...M8lca3Omyzj0XA