GATE PULSAR D Dual Solenoid HPA Engine with TITAN II Bluetooth Expert (Rear Wired)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