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Knights Armament Airsoft URX3 M4A1 Airsoft AEG - High Speed Edition (Package: Add Battery + Charger)

ID: 67734 (AEG-KAA-URX3-M4A1-HS-PKG1)
Knights Armament Airsoft URX3 M4A1 Airsoft AEG - High Speed Edition (Package: Add Battery + Charger)
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G&PKnight's Armament Airsoft

$361.45 $350.61

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FPS Range: 400-430

*Optic shown in images not included

Knights Armament Airsoft URX3 M4A1 Airsoft AEG - High Speed Edition (Add Battery + Charger)

The KAA High Speed line of competition grade Airsoft AEGs sets the benchmark for factory customized high speed guns. The gun is powered by G&Ps' powerful M170 neodymium magnet motor, which drives the reinforced Version 2 gearbox. The sector gear has been short-stroked down to 14 teeth helping to avoid pre-engagement as well as keep FPS to an indoor friendly level. The bevel gear is supported with high quality G&P bearings providing a smoother cycle and higher rate of fire. The high speed URX2 utilizes a G&P M120 spring which provides consistent power, but allows the rifle to be used in CQB settings.


  • Licensed by Knights Armament of Vero Beach FL.
  • Knights Armament laser engraved receiver markings
  • Dimpled style barrel mimics KACs heat dissipation and weight reduction design
  • Rear ambidextrous QD sling point
  • Flip-up adjustable front & rear sights
  • Adjustable Crane style stock
  • 10.5" URX3 RIS
  • G&P 8mm metal gearbox
  • Wired to the rear using Standard Deans plug
Length: 840mm / 920mm , Adjustable
Weight: 4100g (9.04lbs)
Inner Barrel: ~390mm
Magazine Capacity: 120rd Mid-Cap. Works with G&P, Matrix, G&G, Tokyo Marui and Other Compatible M4 / M16 Series Airsoft AEG Magazines
Muzzle Velocity: 400-430 FPS (Measured with 0.20g BBs)
Thread Direction: 14mm Negative
Gearbox: Ver 2 Metal, Upgradeable
Motor: Long Type
Fire Modes: Semi-Auto, Full-Auto, Safe
Battery: 9.6v Small Butterfly Type / 7.4v LiPo Recommended (Wired To Rear With Standard Deans Connector)
Hopup: Yes, Adjustable
Package Includes: Gun, Magazine, Manual, 7.4v LiPo Battery, LiPo Smart Charger, LiPo Safe Bag

Manufacturer: Knights Armament Airsoft / OEM: G&P

Things you may need to get started:
    Battery and Charger Required to power your AEG; use a high quality battery and charger for best results.

    Spare Magazines Stay in the fight longer by bringing more ammo with you.

    BBs High quality precision 6mm BBs recommended; Use 0.20g 0.25g BBs for best results.

    Silicone Oil Basic cleaning and lubrication maintenance help keep your Airsoft AEG in top working order.

About G&P

G&P is among the oldest Military-simulation and training Airsoft manufacturers in the world. Started as a top combat light provider for law enforcement and military agencies around the world, G&P branched into Airsoft manufacturing with the same belief to never sacrifice quality for lower price. Their motto is visible on every G&P product. Every G&P AEG rifle is hand assembled and individually fine-tuned by top technicians in the industry to match G&P's unparalleled quality and reputation. G&P utilizes CNC precision machining and real-steel finish/coating processes on many of their products.

2 Customer Reviews

(Write a review)

by Joseph g. on 10/06/2016
"This is really good gun It shot over 200ft and was very accurate. The only problem was the threaded barrel. When I tried to put a 14mm negative flash hider it didn't go on then I tried my friends 14mm positive flash hider and it went on perfect
by Matthew F. on 12/10/2021
"Fairly accurate out of the box (only tested to 30m, but could easily hit a man-sized target). The externals on the gun are very high quality and extremely solid. The stock and included kac-style iron sights are also good quality and have zero wobble. Threads are 14mm+.

My only (slight) gripe with the externals is that the dust cover can't close, but that doesn't take away functionally from the gun. However, I have seen some cylinders become dented through the mock bolt from an unluckily-placed bb.

There are actually only 13 teeth on the sector gear, and 12 teeth on the piston (2nd tooth removed). However, the piston is polymer with a metal release tooth. I was getting around 14rps on a 2000mAH 25C 7.4V LiPo that fit in the buffer tube, and the gun was shooting ~315fps on 0.28g bbs (~1.28J). Hopup unit is not rotary unfortunately.

My only functional gripe about the internals is that the included M170 motor is WAY too strong for the energy of this gun. I had to replace the motor to something more tame because both the stock wiring and the wiring for the Gate Aster I installed were getting way too hot with the stock motor in.

Something that should be noted is that the gearbox doesn't necessarily play nice with other piston heads unless the piston is short-stroked by at least 1 tooth, as the metal behind the piston is thicker than in other gearboxes. This can cause the piston head to get slightly stuck when its pulled back, which will delay the release and can cause teeth to strip, as well as overheating of the motor/wiring.

Very specific side note, but Perun V2 hybrids don't necessarily agree with the shape of this gearbox, as the trigger magnet physically hits the vertical sensor, which is a no-no according to Perun's manual (I'm not sure exactly what part of the gearbox causes this misalignment). This was tested using G&P, CYMA, Retro Arms, and Krytac triggers with the Perun unit in various positions.

Overall 4/5 for nice externals and pretty decent oob performance, -1 star for non-apparent piston head compatibility issues and overpowered motor.

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