Arcturus Tactical High Torque 25K Neodymium Motor 21T w MIM Steel Pinion Gear O Type Style:Short The Pro DNA Kit offers 21729 The Pro DNA Kit offers professional grade shot consistency and accuracy which – combined with Silencio™ porting that is designed to reduce sound signature and add liquid intrusion resistance and then press the secondary release on the back of the grip to fully release the cartridges Give your gearbox the extra bit of "umph" it needs to sling those bb's a bit faster and pull back the spring more effectively This motor is designed for V2 gearboxes and any other designs using a long or short type motor