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Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: Slim Keymod 15")

ID: 81100 (GR-MTX-ST-GBB-11-ABK)
4.9 stars, based on 12 reviews
Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: Slim Keymod 15)
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$199.00 $158.00


  • 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 Keymod compatible handguard with Keymod mounting points on the 3 O'Clock, 6 O'Clock, and 9 O'Clock positions

FPS Range: 340-380

Length: 765mm-855mm, Adjustable
Weight: 3300g
Inner Barrel: ~380mm
Magazine Capacity: 50rds Uses Matrix, G&P, Western Arms, King Arms, Inokatsu, and compatible magazines.
Muzzle Velocity: 340~380 FPS (Measured with 0.20g BBs and Green Gas)
Thread Direction: 14mm Negative
Gas Type: Green Gas
Fire Modes: Semi/Full-Auto, Safety
Package Includes: Gun, Magazine
Hopup: Yes, Adjustable

Manufacturer: Matrix. (USA) S&T (Asia)

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 S&T

S&T is a group of Airsoft enthusiasts that produces rifles and parts based on the trends in the Airsoft industry. Their mission is to supply a wide range of quality products with the most competitive pricing for dealers and consumers alike. S&T was founded in 2009 with their HQ office located in Hong Kong, a subsidiary office in Japan, as well as Airsoft / Airgun manufacturing facilities in China.

12 Customer Reviews

(Write a review)

by scott t. on 03/22/2019
"I just purchased a mystery box and recived this gun and upon receiving it and going over it and test firing it I'm very pleased with my purchase I have plenty of other weapons I've purchased through evike and have been looking for something I can do a sniper gas mood to and this us perfect a++ as always
I also have the 150 dollar model of this I have done a marksman build with so once again a++ guys
by Donald K. on 03/22/2019
"The CQB-R variant is my first ever GBBR, and I love it. It’s super cheap and gets the job done. It fires way over 350 FPS (my cqb arena’s limit) at around 380-390 for the first 10 or so shoes after a fresh refill of green gas, but dips down to 330 after that. However the upper, lower, pistol grip, and stock are all plastic, but the buffer tube and RIS are metal.
by Kai Mana K. on 11/16/2018
"Let me preface this review, I am new to airsoft and gbbr so keep this in mind. I have had the 13” Keymod version for about 2-3 months have used this both for indoor and outdoor fields. It has only been used for skirmishes so far but I can not complain. This rifle is solid! The look of the gun is superb, I feel the construction is up to par (my airsoft guns and real steel are tools in my eyes and are used/abused as such, I don’t baby them), and it’s accurate to nearly 40 yards. I have dropped and thrown this thing and there’s nothing more than a scratch on it (keep in mind this thing also came scratched up). The only complaint I have is the rear bus, you have to have the flap folded up to fold the sight down, and the front sight is a little loose and has some play in it now. Other than that I strongly recommend this rifle to anyone looking to get into gbbr!

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