The DOD blows tons of money on replacing shot out firearms. I have been "voluntold" to do change of command inventory quite a few times. That is a top down inventory of everything a unit has for the incoming commander to sign for. Any firearm that even looks out of spec is tagged and set to higher level maintenance to get fixed or replaced completely. I watched a M4 with a crooked front sight get tagged for demolition rather than just replace the part. But in any case, using +p+ 9mm ammo doesn't bat a single eye when it comes to wear and tear on firearms. So I guess the 9mm NATO +p wasn't wearing the M9 down fast enough.