Wilson Combat TRETUM2 Enhanced Trigger Unit Universal Black Two-Stage Fits AR-15/AR-10

The Enhanced Trigger Unit, the most advanced modular AR trigger unit yet. The black DLC (Diamond-Like-Carbon) physical vapor deposition finish on essential action parts comprises chromium and tungsten underlayers that give superior corrosion protection. So your ETU will continue to work as smooth as glass even under heavily fouled conditions for years to come.