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  • Cyma CM518 M4 SIA Custom Muzzle Break in Blue
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  • Cyma CM518 M4 Electric Rifle in Black
  • Cyma CM518 M4 Electric Rifle in Black front sight
  • Cyma CM518 M4 Electric Rifle in Black
  • Cyma CM518 M4 Electric Rifle in Black
  • Cyma CM518 M4 Electric Rifle in Black
  • Cyma CM518 M4 Electric Rifle in Black rear sight
  • Cyma CM518 M4 Electric Rifle in Black magazine
  • Cyma CM518 M4 Electric Rifle in Black rear sight
  • Cyma CM518 M4 Electric Rifle in Black
  • Cyma CM518 M4 Electric Rifle in Black
  • Cyma CM518 M4 pistol grip
  • Cyma CM518 M4 Electric Rifle in Blue

Cyma CM518 M4 SIA Custom Muzzle Break in Blue

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£109.95 £139.95
(You save £30.00)

The sales of this item has been restricted to adults only. There is no minimum age requirement by law to use this item, however adult supervision is recommended at all times.

Current Stock:

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Cyma CM518 M4 SIA With Custom Muzzle Break in Blue 

Key Features

- metal gearbox shell
- cylinder type 1
- reinforced steel slide bearings 8 mm
- M110 spring
- steel gears set
- Reinforced spring guide with bearing
- Hi-torque motor

The CYMA CM.518 is an inexpensive and simple way to begin playing airsoft, and it offers something for every user.



The CM518 is one of the new Starter Skirmisher rifles that are part of the CYMA Sport Series. CYMA is one of the most well-known Chinese producers in the airsoft industry.

The rifle has a metal gearbox and other mechanical parts, like those found in more expensive guns, but is still affordable enough for airsoft newbies.

This electric M4 Airsoft Rifle is a replica of one of the most popular and iconic weapon platforms currently in use.

However, the CM.518 BB Gun features a custom-designed muzzle break for a distinctive appearance and functionality.

The rifle's handguard, receiver, stock, buffer tube, and flip up sights are constructed of a durable but extremely lightweight polymer, and its barrel and internals are made of a reliable alloy for accurate and dependable shooting.

Unique to the CM.518 is the muzzle break compensator attached to the front handguard, giving it an aggressive appearance and, more importantly, allowing for 21 inches of 20mm RIS/RAS rails, as well as two 3-inch and a bottom 3-inch rail systems at the front of the rifle, and M-LOK functionality on the rifles handguard sides.

This provides the M4 with an insane number of customisation options, including sights, scopes, torches, lasers, and PEQ units, to name a few. You name it, the CYMA CM518 M4 can probably accommodate it.

The muzzle can be removed by removing two screws from the front of the rail, allowing the compensator to be easily removed to reveal a 14mm CCW thread and standard M4/AR flash hider for attaching silencers and suppressors.

The rail continues onto the body of the rifle to give it a unified, monolithic appearance and to allow you to equip a different sight in the future.

In order to replicate the M4 as closely as possible, the body of this Airsoft replica features a dummy bolt catch and is constructed from lightweight, yet dense polymer, allowing for easy manoeuvrability on the field.

The fire select is designed for right-handed use and can be easily toggled between modes with the thumb, while the magazine release on the right side of the firearm is easily accessible with the trigger finger.

Included is a timeless fashion STANAG magazine is a 300-round high-capacity magazine that can be easily reloaded from the bottom, allowing you to fire in full auto for extended periods of time.

Pulling back the bolt catch reveals the internal Hop-up unit, which is adjusted by turning the gear, allowing you to set the BB spin as well as the windage, elevation, and range.

The stock of the M4A1 is adjustable at six locking points, allowing you to adjust the length of the stock between 70cm and 80cm, depending on your size, for a more comfortable shoulder weld. Rubber is used to construct the butt-plate of the stock, providing a nonslip surface when using the rifle.

This firearm is rear-wired, which allows the battery connector to be accessed by simply pulling down the adjuster tab on the stock and removing the stock to expose the buffer tube and Tamiya connector. A wider variety of batteries, such as crane stock batteries in the stock itself or Li-Po batteries that fit down the buffer tube, can be used.

The tight-bore barrel is a great addition because it allows for greater accuracy and range, allowing it to hit targets at longer distances than M4s without this feature.

This is the ideal AEG for beginners who want to begin playing skirmishing games.

It is a great option for run-and-gun players seeking a weapon that excels in both CQB and large-scale environments due to its durable, lightweight construction. The CM.518 includes everything you need out of the box, allowing you to immediately begin capturing objectives and eliminating opponents. In the future, you can customise to your heart's content thanks to the 20mm quad rail system's vast array of potential upgrades.

we also sell this in two tone blue, black or Tan


Other Features

Unique looking handguard
Finger ridged lower receiver
Textured pistol grip
21' inch 20mm RIS / RAS Top rail
Two side 3 inch 20mm RIS / RAS rails
Bottom 3'inch 20mm RIS / RAS rails
Unique front end compensator
14mm CCW threaded outer barrel
Removable flip-up front and rear ironsights
Mock bolt release
Mock forward assist
300 Round high capacity magazine
Adjustable radial Hop-up unit
380mm inner barrel
Six position adjustable crane stock
Rear wired V2 alloy gearbox
Rubber butt plate


Set includes:

- 300rd Hi-Cap magazine
- 8,4V 1100mAh battery with EU charger

Full details
Weight: 1800 g
Colour: black/blue
Material: ABS, aluminium, steel
Fire mode: full auto, single, safety
Magazine model: hi-cap
Magazine material: ABS
Battery included in set: YES
Battery Type: NiMH
Battery connector type: small Tamiya
Battery cells type: mini
Gearbox Version: v.2
Bearings type: steel sliding
Bearings diameter: 6 mm
Barrel thread type: counter-clockwise
Length: 795/880 mm
Magazine capacity: 300 BBs
Battery voltage: 8,4v
Battery capacity mAh: 1100
Length of internal barrel: 380 mm
Muzzle velocity fps: 350 fps
Barrel thread diameter mm: 14
Diameter of Internal barrel: 6.03 mm
Replica Model: AR-15


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Other Details


Product Reviews

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  1. Great gun 4 Star Review

    Posted by Beastyburt on 25th Jul 2021

    This is my first one i have brought and would of gave it 5 stars but not used much as of yet but what i have i done gun feels amazing and delivery was quick just need to get some targets now.

  2. When will this be back in stock 3 Star Review

    Posted by Unknown on 13th Apr 2021

    Was going to buy it but then it said it was out of stock but isn’t say it was put of stock before I clicked on it

  3. Great product 4 Star Review

    Posted by Dawn on 12th Jan 2020

    The only reason it has four not five stars, is due to the slightly ropey instructions. Otherwise, I am very happy with the quality and service.

  4. Best gun 5 Star Review

    Posted by Ian Milton Keynes on 5th Dec 2019

    For a gun out of the box it fire straight nice looking and not too heavy Excellent gun for new starters highly recommended

  5. Beautiful 5 Star Review

    Posted by Unknown on 2nd Sep 2018

    The gun fires amazingly and has caused no issues as of yet (two weeks after purchase). All of the mechanical parts feel firm and work smoothly. The materials used are pretty high quality and are definitely suitable for skirmishes. My only issue with the gun is the iron sight however this can be entirely removed and even replaced with whatever you want that fits on a rail.

  6. Honest words 5 Star Review

    Posted by Unknown on 26th Aug 2018

    Brilliant product for all those wishing to start scirmishing 10/10

  7. Great Gun 5 Star Review

    Posted by Pete on 21st May 2018

    Took delivery of this gun and it has stunned me on how good this is for the price. totally recommend this gun

Delivery Prices start from just £2.50 with free delivery on orders over £75 To the uk mainland *.

Tip - The easiest way to check the shipping cost for what you want to buy is put all of the stuff you want in to your basket. Then in your basket under the sub total there is a link for Estimate Shipping & Tax” click this and fill in the details and it will tell you the shipping cost and if you qualify for free shipping



Free Shipping

Free shipping on orders over £75 To UK Mainland (excluding some parts of scotland) 

Free shipping on orders over £100 To Northern Ireland & the Republic of ireland, Scottish highlands & islands, and I.O.M

Sorry we do not offer free shipping to the Channel Islands


Free shipping is a 5 working day service* (if you order Monday you get it the next Monday)


Delivery price (Mainland UK) 

Royal Mail              (depending on weight)          (2 Days Delivery*From  £2.50 
Economy               (post as much as you want)  (2 to 4 Days Delivery*)   £4.95   Flat Rate
Express shipping  (post as much as you want)  (1 to 2 Days Delivery*)   £5.95  Flat Rate

*Working days (Saturday and Sunday are classed as non working days)

we can arrange a Saturday delivery on request but costs £20 and you will need to call us to pay the balance after making an order.  

Delivery price (Ireland, Scottish Highlands & Islands)

Northern Ireland           From £ 5.95
Highlands and islands  From £5.95
I.O.M                             From £5.95 

Republic of Ireland £6.95  (Flat Rate how ever big or small your order is)
Channel Islands £ 7.95 (Flat Rate how ever big or small your order is)

Delivery price (International Tracked)

(Flat Rate how ever big or small your order is)

Republic of Ireland (IRL)----  £6.95  Price Drop WAS £16

Belgium (BE)---------------  £7.95 Price Drop WAS £15

Netherlands (NL)----------  £6.95 Price Drop WAS £15

Germany (DE)--------------  £6.95 Price Drop WAS £25

Luxembourg (LUX)--------- £9.95 - NEW 

France (FR)-----------------    £9.95 Price Drop WAS £25

Austria (AT)----------------   £11.95 - NEW 

Greece (GR)----------------   £12.95 NEW

Sweden (SE)--------------    £14.95  NEW

Denmark (DK)------------    £9.95 Price Drop WAS £15

Finland (FI)---------------   £15.95 NEW

Italy (IT)------------------   £11.95 Price Drop WAS £16

Portugal (PT)-------------   £11.95 Price Drop WAS £18

Poland (PL)----------------- £9.95 - NEW

Spain (ES)-----------------  £12.95  Price Drop WAS £23

Sweden (SE)--------------   £11.95   Price Drop WAS £15

Slovakia (SK)-------------    £11.95 - NEW

Slovenia (SL) ------------    £11.95 - NEW

Croatia (HR)--------------   £16.95 - NEW

Czech Republic (CZ)-----  £10.95 - NEW

Hungary (HU)------------   £10.95 - NEW

Bulgaria (BG)------------   £14.95 - NEW

Romania (RO)------------  £13.95 - NEW

Switzerland (CH)--------- £12.95 - NEW

Turkey (TR)--------------- £17.95 NEW

Channel Islands ----------£ 7.95  Price Drop WAS £15


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