My EVA's thumb hasn't broken off yet...though I haven't been taking the gun in and out much. Until I get more I'm just going to leave the MA5C's in I guess.
Here's a size comparison, as well as a Joyride helmet comparison for those who are wondering...
Amazing what a little paint can do, eh? And not having egg thighs...
Helmet Comparison: On the left is the first edition Master Chief, and on the right the (Series 3?) Blue Spartan.