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KJ Works Full Metal M4 RIS Airsoft GBB Gas Blowback Rifle

ID: 49835 (GR-6804)
5.0 stars, based on 2 reviews
KJ Works Full Metal M4 RIS Airsoft GBB Gas Blowback Rifle
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Scope not included

$375.00 $318.75

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.

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Scope not included
KJW joined up with Tanio Koba to bring us their latest revision to their M4 Gas Blowback Rifle project. Running on its own proprietary gas system, the KJW GBB M4 RIS is remarkably efficient. The blowback system generates a healthy amount of recoil, giving it a very realistic feel. The rifle comes standard with a blank receiver which is perfect for custom engraving any logo or insignia you may want. Externally it's built solidly and when matched with the steel reinforced internals it provides a great out-of-the-box gun. The M4 RIS comes standard with front and rear flip-up sights, a RIS front end, and rail panel covers to match.


  • Hard-kick blowback system
  • Heavyweight, metal alloy construction
  • RIS front end for tactical accessories
  • 3x polymer rail panel covers included
  • Railed upper receiver
  • Aluminum outer barrel
  • Flip-up front and rear sights
  • Matte black finish
  • Steel and metal alloy internal parts provide great reliability
  • Heavyweight magazine
Length: 785mm-865mm, adjustable
Weight: 3500g
Inner Barrel: 275mm
Magazine Capacity: 32rds. Works with KJW M4 series magazines (not compatible with other brand M4 GBB magazines)
Muzzle Velocity: 450~480 FPS (Measured with 0.20g BBs and Green Gas)
Thread Direction: 14mm Negative
Gas Type: Green gas, propane
Fire Modes: Semi/Full-Auto, Safety
Package Includes: Gun, Magazine, Manual
Hopup: Yes, Adjustable

Manufacturer: KJW

FPS Range: 450-480

2 Customer Reviews

(Write a review)

by Criser M. on 03/24/2015
"I got this gun in early January and so far it has had some ups and downs. In my experience, the hopup has been very unreliable and and set my bb's off curving to the right. I've taken it to a local airsoft shop and had it repaired about 3-5 times. The problem kept repeating itself. That said, now it is shooting straight and is easily adjustable. It shoots like a dream, only other issue I've had was that the bolt catch snapped in half. Not a huge deal, I've already got another on the way for only $13 including shipping. A lot cheaper than the WE and KWA from my experience. Not sure if that speaks as to the quality of this part in negative terms, but only time will tell. Maybe my bolt catch was a lemon. Anyways, here's a list of the pros and cons for the tl;dr people.
-Great FPS
-looks really nice
-flip up sights are awesome and have a fiber optic insert
-Excellent gas efficiency
-feels good in the hands. This is hard to explain but it just feels like a good gun when you hold it

-wobbly rail, stock, and receiver
-hop up issues
-bolt catch snapped (again, maybe just a lemon)
-low rof (somewhere in the 600-700 range)
-finding parts for this gun is next to impossible(I could only find parts by contacting KJW directly)

I'm pretty nit-picky about some of these cons, but here's my conclusion. Unless you're a purist, the wobbly rail and stock are a non-issue as you'll probably replace them anyways. As for the receiver wobble, I put a tiny, paper-thin washer in there and now it's rock solid. The hopup issue was annoying but there is an alternative. There's a guy online who will take your upper receiver and drill a hole in the top, put a screw in, and you can adjust your hopup much easier without risk of deviation in the bb flight path. Overall, I really like this gun. I got a nice Centurion Arms rail system on mine as well as some magpul accessories, and a red dot sight. (I wouldn't recommend using a magnified optic as this guns effective range; at least my guns effective range, is only about 180 feet.) Overall, I'm very happy with the gun, and I can't wait to get some more mags. I hope this helped anyone on the fence about whether or not to buy this gun.
by zachary d. on 01/06/2015
"U get what u buy when it comes to this gun. It has great accuracy and range i was using .25 and hit man sized target a good 35 to 50 yards out (however i remend a higher bb cause even with the .25 i get a stray every now and then) but on top of that u get reliablity it was 40 degrees and the gun stil performed awesome i ran the same mag in rapid secession and it shot all 30 rounds and locked back thanks to the ALREADY INSTALLED STEEL BOLT CATCH

Recoil kicks the same as 22 on full auto u have to try to keep sight picture
Build quality STEEL INTERNALS no need for upgrades
Comes with rail coves, ar rench and has an incredible green front sight post making target accuiring easy

There is wobble in the stock and ris but it comes with ar rench so u can tighten ris
SLOW rof its maybe 600-650 rpm if that on full auto (the cold could be the cause)

Inthe end just hands down great gun that im happy to own and will recommened to any one wanting a gbb

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