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Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: Delta Keymod 13")

ID: 81101 (GR-MTX-ST-GBB-12-ABK)
4.9 stars, based on 10 reviews
Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: Delta Keymod 13)
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$185.00 $149.00


  • 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 2 O'Clock, 6 O'Clock, and 10 O'Clock positions
Length: 765mm-855mm, Adjustable
Weight: 3300g
Inner Barrel: ~363mm
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)

FPS Range: 340-380

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.

10 Customer Reviews

(Write a review)

by Niki v. on 12/05/2018
"First let me preface: I am new to GBB and Airsoft. This is the first airsoft gun I have bought from evike and the only real airsoft battle I have been in is with some spring guns. so label this review as about the gun. I bought the M16A4 and its awesome. I have shot a real Ar15 and i know what a real guns recoil feels like so im coming
at GBB with a higher standerd

Has Good Range(40 yds)
pretty accurate
looks awesome
Rate of fire (really high and sounds cool)
realistic take down

When you shoot it the gun makes a weird springy sound
Rate of Fire is a little high for me you can unload a full mag in 5-6 seconds
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!
by Michael M. on 10/31/2018
"Ive had a couple weeks to use this gbb and so far its been great. For the pricepoint its an excellent rifle havent had any problems yet and im down in south louisiana so thats saying alot. I personally wouldnt recommend this to someone just starting out in airsoft since green gas can get expensive quickly and the mags are hit and miss on quality i got 3 of them and two wouldnt hold the gas in for long but a little teflon tape and all is well. You can use propane but be wary you will get the propane smell every trigger pull. Plan on upgrading to hpa soon so ill update my review after that

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