Contact Us Tel:(626) 286-0360 Store Locations
Temporary Phone Support Hours M-F 9am-6pm PST
Browse by Type or Category
COVID-19 Updates Online store remains open, possible shipping delays (Click for details)

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)
4.8 stars, based on 18 reviews
Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: Delta Keymod 13)
Hover or touch above to zoom
Optics not included
Youtube preview Product image 1 Product image 2 Product image 3


Free ShippingNo Coupon Required
Free shipping within lower 48 US states, no coupon code needed!


  • 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

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.
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.

18 Customer Reviews

(Write a review)

by Chris K. on 02/16/2020

This thing is practically indestructable!

I own a shooting simulator, we have this firearm tethered and use it at a minimum 1,000 rounds DAILY.

The only issue we have had after two months of use, was the charging handle breaking, and the hammer spring being too weak and breaking. Easy to fix issues. Otherwise this thing is unstopable!

I ended up buying four more and running them on all three lanes.
by John K. on 11/13/2019
"Bought the 9 inch Keymod version. It shoots good and is accurate up to 170 ft and hit a half man target over 50 yards. I’m going to keep it brief.

Hard kicking
WA parts compatible
Good gas efficiency
Plastic receivers appear to be a strong poly not like old abs plastic guns.

Mag price
Sights are hooky

People make comment of weird springy sound, which is just the buffer spring making noise - normal and is audible in real AR type riffles. Plastic receivers can be more durable than zinc alloy metal receivers. Buy with confidence - I just spent an additional 160 dollars on steel internal parts, and a new steel bolt and it is more solid than any other GBB out of the box for less money than a GHK
by Wilton M. on 08/25/2019
"I purchased This M4/16 last week and arrived in great package and box up well,Keep in my this is my 1st time buying an Air Soft GBB Rifle. I finally got a chance to test fire it and was able to hit 2" Target from 100 feet 4 out of six shots but I change the rear and front sights to my SiG MPX metal sights since the original sights were not to my like and rear one was cheap plastic and felt it would break if I flip from far shot to near shot. It outer casing seem like cheap plastic but once you hold it and get used to it is all good quality, only con is the metal magazine it's not the easiest to load and only holds 50 BB's, magazines are $45 a piece compare toy sons AEG Rifle Magazines are way cheaper. So far this compares to my real M4 bit with less kicked.

Questions, Answers and Comments

Discuss about Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: Delta Keymod 13) with your friends and fellow shoppers!

Comment or answer questions for a chance to win awesome prizes. Details can be found on the Facebook page. Remember to check "Also post on Facebook" when commenting to qualify for the giveaways!

Have an urgent question about this item? We monitor these comments daily, but it may be faster to email us directly or call us at (626) 286-0360. Our resident experts are standing by to answer your questions!

California Proposition 65 Warning: Cancer and Reproductive Harm -

Search tags for related products