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Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: M4A1)

ID: 75714 (GR-MTX-ST-GBB-05-BK)
5.0 stars, based on 8 reviews
Matrix M4 GBB AR-15 Gas Blowback Airsoft Rifle w/ Reinforced WA System by S&T (Model: M4A1)
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$189.00 $135.00


  • 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 LE type stock
  • Removable carry handle with 20mm accessory rail underneath, ideal for mounting optics
  • Injection molded polymer A1 style handguard
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, Vertical Foregrip
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.

California residents click here for Proposition 65 warning

8 Customer Reviews

(Write a review)

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
by Raul C. on 08/30/2018
"Rifle is amazing, this is my first GBBR and I love it. The rifle performance fantastically and there are plenty of upgrades out there for it, the kick of the bolt is kinda sluggish but feels solid, the trigger isn’t the smoothest by far but if you have a strong finger and you can get a decent fire rate. It is a hard shooting rifle and will probably need .28g or .30g to get long rang shots. If you plan on making it a DMR I highly recommend it, accurate(again if you use .28g or heavier) and the barrel is solid, allowing for stable shots consistent groupings and rail space for tacti-cool points. The polymer construction is great but over time you might want to get a steel frame as the inner parts might become loose

Highly upgradable
Kick is hard and feel great

High FPS
Sluggish bolt travel
Mags are expensive$$

Overall this is a great rifle and great for those who want to get into upgrading gbbr’s(it’s relatively easy). This gun is amazing and I would recommend it to anyone who wants a gbbr
by Jason S. on 07/19/2018
"We just received the M16 variant of this gun a couple days ago. All we have been able to do so far is put the gun through its paces and sight it in. I was initially worried about the polymer shell. It is definitely not cheap polymer. I expect a long service life regardless of the fact it isn't full metal. The internals however are full metal. The magazine feels robust and has worked flawlessly so far. I can refill the magazine 3 times before I notice any drop off in performance. It is wicked accurate. We have a range setup in the back yard of 100ft. This gun easily clears that with next to no hop. I expect with hop adjustments we should be able to hit 150ft reliably. The magazines provided with this gun are also fairly priced. You should be able to purchase the gun and 5 mags for less than $400. This looks to be a great entry into mil sim. I'll make sure to update as we put the gun into field service.

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