this is a great site and very informative. just want to share my experience with the 15-22. No problems so far and i dont have the blue spring. Shot about 750 rounds on the first time out using blazer 525 value pack with 2 fte's and one ftf (looks like a dud). trigger is a little heavy, i might try the "15 min. trigger mod". no mods/upgrade done to it at the moment (waiting for parts and maybe a barrel shroud from beltfed) that's it for now. happy shooting!! 
