Single stage; Available Pull Weights: 3.5lb; Trigger pull is factory pre-set and not user adjustable; Enhanced Bolt Hold Open Button; Auto drop bolt hold open; Captured ejector; Fully ambidextrous magazine release with paddle release lever and textured controls; Ultra-crisp trigger with no feel of creep prior to hammer release; The trigger has a glass-smooth break with no feel of grittiness; Minimal lock time is designed into the assembly, assuring repeatable function with either commercial or military grade ammunition