Externals same as current CZ Scorpion EVO 3 A1 AEG New hop-up bucking designed specifically for use with HPA airsoft guns Custom FCU board has empty magazine detection feature, same as the AEG version 210mm inner barrel Muzzle velocity: ~310-425 FPS adjustable Output energy with 0.20 gram BBs: ~0.9-1.7 Joules Rate of fire: ~15-30 RPS adjustable Burst mode: Programmable 2, 3, 5, or 7 round 2 and 3 round burst settings cycle completely with single pull of trigger 5 and 7 round burst settings cycle completely with trigger held down Input pressure: 80-140 PSI Dwell time: Programmable Recommended battery type: 7.4v LiPo with minimum 250 mAh capacity, JST connectors 12 month warrantySpecifications: Operation HPABuild Metal Outer Barrel, Gearbox / Fiber Reinforced Polymer Receiver, Handguard, Rail System, Motor Grip, StockFiring Modes Single Shot, Burst Mode, Full Automatic, Safety ModeMuzzle Velocity 310-425 FPS (w/ 0.20 BBs)Rate of Fire ~15-30 RPS (adjustable)Magazine 75 RoundsRecommended battery type 7.4v LiPo with minimum 250 mAh capacity, JST connectorsHop-Up Yes, AdjustableInner Barrel 210 mmWeight 5.4 LbsLength 623-425mm (Extended-Collapsed)Dwell Time Programmable 1X AEG Submachine Gun