1/1 Scale High Performance Assembled HPA (High Pressure Air) Airsoft SEMI & FULLY Automatic Shooting Mode Easily & Quickly Programmable via a Fire Control Unit All systems are customizable from FPS, Burst & Rate of Fire that can range from a 1 rps to an insane 50+ rps! G&PxPolar Star NEW System Rifle HPA Metal Body MOTS 12 Keymod MRE (Sand) M4A1 Taper Outer Barrel M16 Voltex Type Flashider (14mm Clockwise) Plastic M4 Charging Handle (Black) Plastic Bolt Stop (Black) Plastic Selector (A) (Black) Ball Ball Mid-Cap Magazine (Black) (130rds) Madbull Fully Licensed Strike Industries Grip (Dark Earth) Plastic Rear Sight (Sand) HPA Navy Stock (Black) Keymod Ball Ball Foregrip (Short) (Black) Keymod Soft Rail Cover A Strong recoil spring. Good for 350fps.Specifications:Length - 830mm Weight - 2740g Magazine Capacity - 130 Rounds Power Source - HPA Powered Blowback - None Shooting Modes - Semi, Full Auto Hop-up - Adjustable via breach Magazine Compatibility - G&P AEG Magazine. FPS - 350Offical Polar Star HPA electro-pneumatic system + all G&P custom HPA parts! Polar Star is a USA company (since 2009) known for their widely successful Fusion Engine that converts standard AEGs into an HPA (High Pressure Air) system that's electro-pneumatically driven. These run on an external air tank instead of batteries or propane type gas. It is a top of the line HPA system. Polar Star make 3 products that can make the conversion, the Polar Star Jack, F1, and their top of the line product, the Fusion Engine. G&P's release utilizes the Jack that replaces all analog/mechanical parts inside the gearbox, replacing the Cylinder/Piston set while keeping the V2 gearbox shell. This system provides amazing features that are easily & quickly programmable via a Fire Control Unit. All systems are customizable from FPS, Burst & Rate of Fire that can range from a 1 rps to an insane 50+ rps. Trigger response is also better like GBB. This system is very stable under a wide weather & temperature conditions with very stable FPS shooting thanks to its electro-pneumatic system. It is low maintenance & quick programming too.Includes:x1 G&P M4 Jack. x1 130 Round Magazine. x1 Manual.