Insidious Armory partnered up with Dead Reckoning Customs to have this SDP custom engraved. 1of1, there are no other SDP like this. Features: Custom laser engraved Stamped KRYTAC trademarks SDP front assembly Realistic locking bolt and bolt release Integrated MOSFET; 8mm ball bearing bushings; Easy spring access system with anchored spring guide Ambidextrous fire selector KRYTAC 20K motor Adjustable rotary hop-up 2 position compact carbine stock Follow upgrade I’ve have done internally by professional: -Maxx Model CNC Aluminum Hopup Chamber for M4 / M16 Series Airsoft AEG Rifles (Model: ME - PRO / Limited Edition Snowman Red) -Madbull M100 AEG Spring -Gate TITAN Advanced Airsoft MOSFET AEG Drop-In V2 Rear Wired (haven’t install yet, you can do it yourself or have some else do it for you but the box Titian gate advance will come with the guy purchase) -Modify M4 / M16 AEG Air Nozzle -Lonex POM Ventilation Piston Head -Action Army Infinity AAC R-35000 Motor ( Long ) (still in box haven’t installed in yet because the gate Titian haven’t been installed, will come along with purchase) -Madbull Airsoft Piston Body PX-02 ( Orange ) -CNC Production Version 2 Cylinder Head ( Red ) -Poseidon 6.05mm Air Cushion Inner Barrel For TM Airsoft AEG Rifles -Maxx Model CNC Aluminum Advanced Speed Trigger Style A ( Black ) This is like new. I played with it maybe 4 times since I bought it this year. I can ship faster service if you are willing to pay the extra price for it. Any questions and offer please message me. I’m not interested in trading unless it’s a hicapa build. If you’re local I can meet you in public for delivery. Im OPENTO offer but please no low ball