PULSAR D HPA Engine (dual solenoid, closed-bolt) with TITAN II Bluetooth® EXPERT– thanks to optical sensors combined with HPA technology, you get an absurd trigger response never before seen in airsoft. Get insane muzzle velocities ranging from 250-650 FPS & ROF from 1-40 RPS for CQB, assault, and sniper replicas. Closed-bolt and the innovative feed system guarantee you a straight and repeatable BB trajectory even in full AUTO – every time. Engine calibration has never been easier – PULSAR D & T