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Happy Holidays! 20% OFF with coupon code: HOLIDAY20 (Exclude MAP and SALE Items) Custom KWA KM4S Airsoft AEG Rifle (2GX 9mm Gearbox Version)

ID: 28993 (CG-E01-011)
4.8 stars, based on 30 reviews


Sorry, this item is Discontinued

MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.
CanadaExport Compliant
This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.

No Payments + No Interest if paid in full in 6 months through PayPal Credit. Simply check out using PayPal and select PayPal Credit! Custom KWA KM4S Airsoft AEG Rifle (2GX 9mm Gearbox Version)

This is a custom built KWA based Airsoft M4 AEG Rifle done right here at!

The second-generation KWA airsoft rifles feature over 30 structural improvements and performance upgrades, making them the top choice for professionals and serious enthusiasts.

The KM4S sports a skeletal fore grip made with impact resistance polymer and alloy rails. The skeletal fore grip can accommodate a variety of batteries including an 8.4V 7-cell NiMh mini battery pack. Full metal, adjustable flip-up front and rear sights are used to maintain the streamline look of the gun.

Built upon the KM4A1, the KM4S-Tactical is equipped with a reinforced, high performance metal gearbox and is LiPo-ready when you are. Performance specs match those of the KM4A1.

  • Overall Length (Retracted) = 77.47 cm [30.5"]
  • Overall Length (Extended) = 85.73 cm [33.75"]
  • Outer Barrel Length = 381 mm [15"]
  • Inner Barrel Length = 395 mm
  • Inner Barrel Diameter = 6.05 mm
  • Weight = 3.03 kg [6.68 lbs]
  • Barrel Thread = -14 mm
  • Caliber = 6 mm
  • Magazine Capacity = 350 rounds
  • Rate of Fire = 20+ RPS
  • Velocity = 118-125 MPS [390-410 FPS]
  • Energy Output with 0.20g BB = 1.49 Joules
  • Power Source = 9.6v NiMh, 7.4v or 11.1v 15c Li-po / Li-Fe
Special Features:
  • KWA 2GX Gearbox
  • KWA 2G High Performance Bucking
  • Removable carry handle
  • Flat top receiver
  • Full metal alloy receivers
  • Adjustable front and rear sights
  • Semi and Full Auto selective fire
  • Adjustable Hop-up
  • 6 position collapsible stock
  • Fiber reinforced handguard with battery compartment

* Individual test results may vary depending on brand of bbs, and chronograph used.
** Results are based on tests conducted with 11.1v 1500mAh 15A LiPo batteries.
*** Orange tip flash hiders are required for all US sales or where applicable by law.

* custom guns are build to order by our team of industry leading technicians. Custom guns may require one additional business days to construct, QC, and ship.

FPS Range: 390-410

30 Customer Reviews

(Write a review)

by Lisa T. on 07/12/2012
"So I've had this gun for a year now and it still works perfectly its pretty light and nice to and I'm really short I only gave this gun 4 stars because of the poor battery compartment ya you can fit an 8.4 perfectly but no one wats to do that. I bought a battery bag and custom wired it to the out side it worked perfect around 20 reps with a 9.6 I have an 11.1 lipo now and its like 25 rpshighly recommended.
by Todd N. on 09/26/2011
"after buying this gun i was very disapointed to find that the battery compartment was the worst battery compartment that i have ever seen, i couldnt even fit an 8.4 1100 ni-mh into it. after switching out the hand guard for a more classic versoin of the m4 hand guard, the gun worked great, at 420 fps and a 25 bb's per second rate of fire, this gun dominates at any airsoft field. i give this gun 4 stars becuase of the terrible battery compartment and becuase after buying all the replacement parts the gun came to a huge 500$ price.
by steven E. on 09/08/2011
"So I picked this M4 up because of the great things I've Heard about KWA airsoft guns... I get the package in with all the bells and whistles I ordered with it, and low and behold I'm one of the few that have the semi-auto fires auto problem. I contact Evike and they tell me to take the gun in and they'll give it a look. Turns out it was a easy fix, which is on the KWA web site. When the battery runs low it somehow causes a timing problem. The fix is to charge the battery (of course), and burn off like 50 rounds in auto. case closed. Evike handled everything with a smile and even took back a item I bought that I didn't need (to my surprise because they have a all sales are final rule. That rule being mostly for people that just buy stuff on a whim and return it later)

Great gun and great store!!!!! They'll Have my business from now on

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This item is Discontinued.