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Classic Army M4 13" ARS4 Keymod Carbine AEG Airsoft Rifle (Black)

[R04C00][21318 / CA083M]
( 4 Reviews ) ❤ Add to Wishlist

Classic Army is a leading manufacturer of Airsoft products, setting standards for the entire industry. Classic Army produced the first full metal production M4 and MP5 AEGs. Classic Army built the first glass-filled nylon fiber AEG in their G36. Classic Army was the first to introduce a high-end SCAR AEG. Since inception, Classic Army has been an innovator in design and production of Airsoft guns for the collector and wargamer market, offering a wide selection of products to suit their customers' tastes and needs. Through their years of experience and knowledge, Classic Army has developed their creed of Total Performance

The Classic Army M4 ARS4 is an M4 with a 13" free float keymod rail and an 14.5" outer barrel. The monolithic profile rail system has a standard picatinny configuration on the top and bottom rails, allowing for fitting of standard railed mounted scopes, lights, lasers, forward grips, grenade launchers, or other accessories. The gun features an ergonomic grip, flip up front and rear sights, and a retractable crane stock, and a sling adaptor plate. This gun comes individually serial numbered and comes with a 300rd metal high capacity magazine.

Internally, the gun has a 9mm bearing gearbox, inline mosfet protected trigger contacts, stainless steel bore up cylinder, aluminum bore-up cylinder head, metal spring guide with bearing, 6.03mm tightbore barrel, silver low resistance trigger wiring, and a quick change spring system. The wiring utilizes a low heat deans plug and comes with an adapter for tamiya connector batteries. It will shoot 375-400 fps using 0.20g BBs and 800-900 rpm using a 9.6V battery. The quick change spring system allows for fast and easy spring changes without having to go into the gearbox.

Manufacturer: Classic Army
Model: ARS4
Muzzle Velocity: 375-400 FPS
Magazine Capacity: 300rds
Color: Black
Package Includes: Gun, Magazine
Warranty Length: 90 Days
Warranty Handler: Classic Army (Warranty Policy)


  • Metal Construction
  • Metal 13" Keymod Rail System
  • 6.03mm Tightbore Inner Barrel
  • Quick Change Spring System
  • Flip Up Sights

Please Note:

  • Keymod rail section is NOT included.
  • Battery and charger are NOT included.
  • Optic is NOT included.
Manufacturer: Classic Army
Muzzle Velocity: 375-400 FPS
Magazine Capacity: 300rds
Fire Mode: Safe - Semi - Auto
Color: Black
Package Includes: Gun, Magazine
Outer Barrel Length: 14.5"
Stock Type: Crane Stock
Sight: Flip Up
Overall Length Extended: 850mm
Overall Length Retracted: 660mm
Weight Empty: 2880g
Cylinder Head Type: Aluminum Bore-Up
Piston Type: Heat Treated Polymer
Spring Guide Type: Metal Spring Guide W/ Bearing
Bushing Size: 9mm
Bushing Type: Bearing
Inner Barrel Length: 363mm
Connector: Small Tamiya
Quick Spring Change: Yes
Primary Build Material: Metal
Gear Box: Version 2
see 4 reviews | Write a Review
verified buyer For: Classic Army M4 13" ARS4 Keymod Carbine AEG Airsoft Rifle ( Option )
A. BRAVO | 2017-09-25
Product Information:
This is my go to rifle and it shoots straight. and can a take a beating but NOT blowback lol

- Shoots very well
- I can take a beating
- feeds well with a variety of magazines

- The pug at the front of the crane stock fell off
J. LEAVITT | 2017-11-19
Product Information:
I’ve had this gun for about a month and I continue to like it more and more. I’ve tested it in game play, with .25 B.B. I was raking in 310-314 fps. This is when it’s bone stock, ive ordered a upgrade spring, a angle custom tight bore barrel and a new bucking to increase accuracy and FPS. With this being said the accuracy out the box is very good. I am just upgrading because I want too. I would buy this again

Great build
Awesome gun

Ejection port cover doesn’t like to stay closed
S. JESTER | 2018-02-25
Product Information:
Bought the gun in a buy one get one. It is really nice. I upgraded the motor to an echo 1 red because I also plan on putting lower ratio gears and a slightly higher spring in. Stock gun is a beast as long as you run an 11.1v lipo.

Really good rate of fire and trigger response for having 21:1 gears.
The mosfet is hardy enough to do the job.
Feeds any mag I've thrown at it.
Good range out of the box.

The accuracy can be lacking sometimes past around 100-120 feet
stock velocity is a bit low for some outdoor fields. (my field has a 400fps limit and this gun does ~300-310)
My buffer tube was in so tight I had trouble removing it and nearly shredded some wires.

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