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Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System (Model: MLOK 13")

ID: 81097 (GR-MTX-ST-GBB-10-ABK)
4.6 stars, based on 36 reviews
Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System (Model: MLOK 13)
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MatrixGolden Eagle


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  • Utilizes the Western Arms gas blowback system ensuring reliable performance with a plethora of aftermarket parts and accessories
  • Injection molded polymer receiver provides rugged durability without the additional weight of a metal receiver
  • Improved gas efficiency, reliable feeding and firing in full auto
  • Adjustable SOPMOD type stock
  • Flat top receiver is ideal for mounting optics or other 20mm accessories
  • 20mm railed MLOK compatible handguard with MLOK mounting points on the 3 O'Clock, 6 O'Clock, and 9 O'Clock positions

Manufacturer: Matrix

FPS Range: 340-380


Length: 765mm-855mm, Adjustable
Weight: 3300g
Inner Barrel: ~363mm
Magazine Capacity: 50rds Uses Matrix, G&P, Western Arms, King Arms, Inokatsu, and compatible magazines.
Thread Direction: 14mm Negative
Gas Type: Green Gas
Fire Modes: Semi/Full-Auto, Safety
Package Includes: Gun, Magazine
Hopup: Yes, Adjustable

About Matrix

Established in 2001 for Airsofters by Airsofters. Team Matrix thrive on the vision to better the sport of Airsoft with affordable high quality Airsoft equipment. With decades of experiences as Airsoft enthusiasts ourselves, we live, sleep, and breathe Airsoft. Matrix offers a wide selection of skirmish grade replicas from rifles to pistols, a wide variety of accessories, and tactical equipment from helmets to boots. It is the Matrix mission to prepare every Airsoft shooter the perfect experience!

About Golden Eagle

Golden Eagle International (HK) Limited was founded in 2007, with strong experience in developing and manufacturing high-quality airsoft guns, airsoft parts and related survival game products under the brand GE Airsoft (Golden Eagle Airsoft). As a professional supplier, our goal is to ensure customer satisfaction by providing high-quality products and excellent after-sales service.

36 Customer Reviews

(Write a review)

by Ian H. on 03/26/2023
"So I was skeptical and shot on a review for awhile; but after having some more expensive GBBRs with worse results this is really a great deal!

I had the M4A1 model; lasted about a year before I really had issues; needed a new nozzle and bolt; simply due to wear but it got it backup and running!

I wish the accuracy was a bit better; also I “lost” two magazines that simply developed leaks and I couldn’t save (past warranty so attempted to fix with RTV silicone) so be prepared to maybe dish out for new mags at some point; but the magazines that have been good from the start have stayed good.

If you don’t want to spend your life on a GBBR, this is the way to go; you can spend $600, but keep in mind all green gas still has the same limitations; I live in the northeast and ever GBBR I have struggles with gas efficiency and cold weather; magazines sell out quick, if you just want to see if GBBRs are for you, start here!
by Keith B. on 01/24/2023
"I bought the "Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System (Model: Slim MLOK 15")" model back in September 2022 when it was on sale, it was my first GBBR (I've had many GBBP - pistols WE Tech) and was nervous that it was so cheap on sale, it is all reinforced Polymer and made in China (not Japan or Taiwan).
It uses the Western Arms Gas System and hence any "WA" compatible Magazine. The Polymer Castings are Top Notch Quality, the Upper and Lower fit VERY Tight, No Wiggle at all, and the great MLOK forearm is Aluminum and fits tight, although the factory installed it a bit crooked which is easy to adjust.
- It's a gorgeous Full Length M4A2 rifle, it looks metal, realistic weight and feel.
- Upper and Lower fit Tight, Metal Buffer Tube, Metal Bolt and Charger.
- GBB Mags fit snug, trigger pull is excellent no "step", moderate weight pull.
- 14mm CCW Threaded Barrel Muzzle, minimal free-float barrel movement.
- 380 to 400fps w/.30 BBs, consistent 2" groups at 150ft in S.A. Fire.
- OK Iron sights, good quality "Fat" K Butt Stock", Flat Trigger guard (replace that!)
- "WA" system GBB 50rd Mags are cheaper than WE or T Marui types & never fail +!
- Sloppy factory install of MLOK forearm, easy to readjust, though.
- Virtually NO lubrication internally, especially the Bolt which "hung" out of the box.
- Some of the Polymer casting seams are sharp, you'll have to sandpaper them flat.
- Black paint already wearing off Selector and Charger after just 1 month of use.

Summary: I immediately built up mine as a Replica M4 Mk12 DMR use, it's that Accurate and Powerful. I run mine with a 190mm Silencer Can I design and other than the blowback mech sound, you don't hear this GBBR! I've used it on 12 outdoors MilSim Game Plays with Zero problemo's. It also makes a great Infantry Rifle too. This was my first GBBR, and I'll unlikely buy another AEG now unless it's a Machine Gun. I'm already planning on buying one of these JG Works made Golden Eagle /Matrix BGGR in a M4A3 Carbine length now ..... as soon as Evike or someone has them on sale again! (Hint
by Marrick S. on 01/04/2023

I not new to gas blowbacks it took me a lot of studying and research but nevermind that

The bolt carrier has an orange nozzle i guss that’s what the part is call. I appreciate the build of the bolt carrier but average of 380fps.. mmm I like to go higher.
The gun also had the lower receiver to be polymer hard plastic. It was as if held a pellet gun for a second. The functions are pretty much Western Arm/G&P/GE/Matrix.

So my recent gun, the Daniel Defense Mk18 western arms has a silver steel bolt, with a black nozzle and I gave the buffer tube an upgrade. With that bolt carrier and strong spring and buffer from the Mk18, I can say 410fps with 25g

I switched the upper receivers so now DD/GE/Matrix/WA M4 M-lok is its new name I guess. It was a struggle because of of the pins. Anywho, shot the gun since the mag came in the box with a good amount of gas. I shot it and I believe i increased the fps and range. It was very hard to detect the rounds they shot out to fast. I have a lake behind my back yard and I had no fence I could easily see other neighbors’ houses from a cross I shot in the direction away because the the bb could reach over to hit property. But when I mix the GE with DD The New Model Was SICK!!!
Literally the bb shot and flew up or near direct after that I couldn’t see it no more.
I shot the weapon from inside my house at the back door
And aim the gun across to the other side of the lake.
I tried and tried to see if the bb will hit the water. If it didn’t that would either meant the fps got lower or velocity against wind. But i shot 10 rounds all kept going straight or curving up and i was at 25g. Which tell me that this gun is capable to hit midrange.

The magazine. Many of you can find it very hard to find. But before its too late, search Golden Eagle GBB M4 Magazine.
They are the exact the same as matrix’s magazines. You can find them on other websites, but please be careful.

I bought this gun for the purpose to get an extra mag and to change the railing from 20mm picatinny to M-Lok
Changing the receiver with better parts according to the manufacturer. I unexpectedly increase its power which is awesome and its 2 tone, black and dark earth.

My suggestion to buy for the gun is more mags for sport play, metal lower receiver, a better bolt carrier system, and improved the buffer system. But the its self is great. Very nice built and I planned to treat it with respect and nice accessories and I gave her a name.

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