CYMA CM.518 M4 w/ Custom Muzzle Brake

  • Unique Compensator
  • Finger Ridged Receiver
  • 21'' Monolithic Top Rail

Custom external components come together to create one unique looking piece. Featuring a highly customisable top rail, which in total is 21'' in length.

Full description


The rifle is constructed mainly from Polymer, with a Polymer Receiver, Sling Plate, Buffer Tube, Hand Guard and Pistol Grip with Alloy Barrel and Internals. The weapon comes pre-fitted with a unique looking Hand Guard and Compensator, which can be removed by releasing the two screws at the front of the rail, allowing the compensator to be simply pulled off to reveal a 14mm CCW Thread and standard M4 / AR Flash Hider for attaching Silencers and Suppressors. The weapon features a highly customisable top rail, which in total is 21'' in length, and fits together like on piece, allowing for a huge variety of Sight and Scope setups, as well as Magnifier and Holographic Setups. The Hand Guard also features two 3'' and a bottom 3'' 20mm RIS / RAS Rail for attaching Grips, Bipods, Torches and Lasers to your weapon. The rifle is rear-wired, meaning batteries are stored in the 6 position Adjustable Crane Stock, which accepts crane / butterfly style batteries. The Stock also features a rubberised Butt Plate which prevents slippage whilst wearing large rigs and vests. This rifle is perfect for those who are beginning out in Airsoft, and are looking for a unique looking piece which will make them stand out on the field.

Other Features: 

  • Unique Looking Handguard and Compensator Look
  • Finger Ridged Lower Receiver
  • Textured Pistol Grip for added Grip whilst wearing Gloves
  • 21'' 20mm RIS / RAS Top rail for a huge variety of Aftermarket Sights and Scopes
  • Full Length Monolithic Top Rail allowing the use of Holographic and Magnifier Setups
  • Two Side 3'' 20mm RIS / RAS Rails for attaching Torches, Lasers and PEQ Boxes
  • Bottom 3'' 20mm RIS / RAS Rails for attaching Grips and Bipods
  • Unique Front End Compensator
  • Front End can be removed to reveal a 14mm CCW Threaded Outer Barrel
  • Removable Flip-Up Front and Rear Ironsight
  • Polymer Mock Rear Sling Plate
  • Mock Bolt Release
  • Mock Forward Assist
  • 300rnd High Capacity Magazine
  • Functional Charging Handle which when pulled back reveals the Hop-Up Unit
  • Radial Style Hop-Up Unit for added Range and Accuracy
  • 380mm Inner Barrel
  • Six Position adjustable Crane Stock for different size Users
  • Rear Wired V2 Alloy Gearbox
  • Battery stored in Crane Stock
  • Rubber Butt Plate to prevent Slippage on Rigs and Vests

Package Includes:

  • CM.518 M4 w/ Custom Muzzle Brake
  • Magazine
  • 8.4v 1100mAh Ni-Mh Battery
  • 8.4v 300mAh EU Pin Charger

Special Instructions:

Please note that the Rear Sling Plate is made from plastic, and the rifle sling is basic, and is for looks. Should you want to use the rear sling plate it is suggested that you replace it with a Metal Version, such as the: NUPROL M4 Sling Plate AEG, and a heavy duty sling such as the NUPROL One Point Bungee Sling. Should you need help fitting these parts you can give us a call on: 01484 644709.

The Rail Integrated Compensator is removable by first removing the screw on either side, and then pulling off carefully by hand. This reveals a 14mm Counter Clockwise (CCW) Thread, which allows the attachment of Silencers, Suppressors and Tracer Units.

The Battery and Charger which is supplied with the gun will function perfectly, however, these are considered free gifts and are not as high a quality as other Battery and Charger we sell. We recommend that you upgrade these before you start skirmishing with your rifle and recommend: NUPROL 9.6v 1600mAh Ni-Mh Crane Battery, and NUPROL Compact LiPo / LiFe / NiMh / NiCd Balance Charger. Which will last longer and charge faster.



Weapon Construction External
Weapon Type
Assault Rifle
Over 18 Only Icon
Over 18
Icon UKARA - United Kingdom Airsoft Retailer Association
Defence / UKARA Required
Yes, No,
FPS Icon
FPS (Feet Per Second), using 0.20g BB
Approx. 330fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Screwdriver Icon
Included Items
  • Magazine
  • Cleaning Rod
  • Battery
  • EU Pin Charger
  • Ironsight Set
Skill Level Icon
User Skill Level

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 1.8kg
Weapon Length Collapsed
Length (Collapsed)
Weapon Length Extended
Length (Extended)


Colour Wheel Greyscale
Primary Colour
Black, Tan ,
Colour Wheel Greyscale
Secondary Colour
Two Tone Icon
Pre Two-Toned
Construction Icon
Full Polymer reciver, pistol grip and stock
Weapon Construction External
External Construction
Gearbox Icon
Internal Construction

Weapon Specific

Power Source Icon
Powered By
Blowback Icon
Weapon Platform
M4 / AR15 / M16
Magazine Style Icon
Magazine Style
Fire Select Icon
Fire Selector
PatrolBase | Fire Select Safe
Patrol Base | Fire Select - Semi Automatic
Semi Automatic
Patrol Base | Full Automatic
Full Automatic
Weapon Safety Features Icon
Safety Features
Trigger Lock
Shooter Configuration Icon
Shooter Configuration
Right Handed
Weapon Configuration Icon
Weapon Configuration
Suggested BB Weight


Hop-Up Unit Icon
Hop-Up Unit
Hop-Up Unit Adjuster Icon
Hop-Up Adjuster
Hop-Up Unit Location Icon
Hop-Up Location
Behind mock Bolt cover, when charging handle to the rear


Weapon Furniture Icon
  • Flip-Up Ironsights
  • AR Buffer Tube
  • Railed Receiver
  • Sliding Stock
  • MLOK Rail System
  • Mock Jail Break Style Muzzle Device
Rail System Icon
Rail System
20mm RIS / RAS , MLOK Rail System,
Icon Stock Positions
Stock Setting
Weapon Length Extended
Stock Positions
5 Position
Sight Type Icon
Sight Type
Aperture Iron Sight
Sling Plate Icon
Sling Options
Stock , Loop ,

Magazine Specific

Magazine Type
Magazine BB Capacity
Approx. 300 Rounds
Magazine BB Fill Method
Fill Window
Magazine BB Fill Location

Electric Gun Specific Information

Gearbox Icon
Gearbox Version
V2 Gearbox
Wiring Icon
Gearbox Wiring
Rear Wired
Spring Change Icon
Gearbox Quick Change Spring
Digital Trigger Icon
Gearbox Electronic Trigger
Airsoft Motor Icon
Motor Type
Battery Specific
Battery Connector
Patrol Base | Icon | Mini Tamiya
Mini Tamiya
Included Battery
Battery Type
Battery Voltage
Battery Amperage
Suggested Battery
Suggested Battery Type
Suggested Battery Configuration
Suggested Battery Voltage

Product Testing Data

Notepad Icon
Test Description
Tested using 0.2g BBs
Notepad Icon
Test Date

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