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  • Cyma CM508 M4 SIR System in Blue
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  • Cyma CM508 M4 Electric Rifle in Blue

Cyma CM508 M4 SIR System in Blue

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£119.95 £150.00
(You save £30.05)

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.

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Cyma CM508 M4 SIR System in Blue


Key Features

- Metal gearbox
- Skirmish ready
- Loads of rail space
- Good quality build
- High Performance
- Takes any Standard M4 mag
- Great value for money

This is an excellent choice for a first proper skirmish quality airsoft gun for your collection.



The CM508 one of a new series of Starter Skirmisher rifles one of the most popular Chinese manufacturers in the airsoft world called CYMA. This new line of rifles has made waves in the airsoft world and are noted to be the best starter m4's on the market, and it would be hard for us to disagree with that statement.

The rifle has some of the stuff as some other guns costing much more offer like a metal gearbox and other mechanical parts etc., but at a low price to suit airsoft beginners, but don't let the price fool you, what you get with this rifle is a weapon that can more than hold its own against airsoft rifles costing much more.

The Cyma CM508 is based on the most well-known platform of rifles in the world the Colt M4, and this model is a true full 1:1 scale authentic replica of the real thing. The M4 is broadly used by the United States Armed Forces and the United States Marine Corps combat units as the primary infantry weapon. The M4 is also capable of mounting M203 and M320 grenade launchers to it.

On this model, you get a decent quality polymer receiver, with almost no flex, and a metal gearbox with Hi-torque motor. On the side of the bb gun you have the charging handle, if you pull this back, it lets you get to the hop up located under the dust cover. The fire selector is on the side of the gun near the trigger (the same as the real thing). This model has a navy stock that is adjustable, and a front sight there is also a sight built into the removable carry handle on the rifle.

There are sling mount loops on the front and rear of the bb gun, and the handguard has four RIS rails on it for you to attach any aftermarket accessories you wish to get. The barrel of the gun is the longer version making this rifle perfect for outdoor games where you need good accuracy over a more extended range. The gun's magazine is a hi-cap version holding around 300 bb pellets. This mag is the standard type m4 mag meaning that a standard m4 mag from any other M4 will fit this gun, this is good if you already have some or if you go to a game you could borrow of from someone if you get stuck. It also means you can get spares just about anywhere. There is a flip up front, and rear sights on this version and the top rail is long enough to take a telescopic scope if you wanted it to. The rifle also has an adjustable tactical stock on it, to fit almost any users size.

We have imported this directly from the cyma factory to be made to the UK spec especially for bbguns4less, and we don't sell it to any other airsoft or bb gun companies. The difference with this is the guns spring is the correct power to comply with the new UK law, so you won't have to get this gun downgraded. Also, the two-tone colour is made of blue plastic and not painted like every other company meaning the paint won't scratch off after using it. And lastly, it comes with a Rhos UK Mains Charger and rechargeable battery pack (with others you will get an EU Charger meaning you will need to buy an adapter.)

The CYMA CM508 performs great in the field with a good rate of fire, range, power and accuracy, that is ample enough to keep up with much more expensive guns, and with the metal gearbox, it's also going to be pretty reliable. If you don't know anything about airsoft guns, as the rifle is perfect to get you started in the airsoft world.



Weight: 1895 g
Color: black/blue
Material: aluminum, ABS, steel
Fire mode: auto, single
Magazine model: hi-cap
Magazine material: ABS
Battery included in set: YES
Battery type: mini
Battery type: NiMH
Battery connector type: small Tamiya
Battery cells type: mini
Gearbox version: v.2
Bearings type: steel sliding
Bearings diameter: 8 mm
Barrel thread type: counter-clockwise
Serial number: YES
Length: 765 mm
Magazine capacity: 300 BBs
Battery voltage V: 8,4
Battery capacity mAh: 1100
Length of internal barrel: 380 mm
Muzzle energy: 1,49 J
Muzzle velocity fps: 380-400
Barrel thread diameter mm: 14
Diameter of Internal barrel: 6.03mm mm
Replica Model: AR15 / M4 / M16 Airsoft Gun
Manufacturer: CYMA

Set includes:

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

Sku :


Other Details


Product Reviews

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  1. Awesome yet creaky 4 Star Review

    Posted by Kris on 3rd Feb 2022

    The other reviews are bang on, this is a very solid, great starter rifle, however the blue plastic parts creak a lot. Have tried tightening everything I can and using electrical tape between surfaces but still creaks.

  2. Just wow.... 5 Star Review

    Posted by Mark on 21st Jun 2021

    Brilliant weapon, has been used loads in the two days I've owned it, once I had adjusted my hop up and zeroed in my sights I was hitting bullseye consistently with every shot. Quite a bit of power in it too, was able to severely damage a can or two from 25 yards.
    Would highly recommend

  3. Great for starters and pros alike 5 Star Review

    Posted by Lochlan Kirkwood on 3rd May 2019

    This is a beautiful gun fires amazingly and is a very solid gun for the price. I would definitely recommend this gun especially if you are just starting airsoft.

  4. Solid rifle for the price 5 Star Review

    Posted by Mr. Chambers on 27th Mar 2018

    This gun is pretty low priced as far as skirmish AEGs go, so I really wasn't expecting what I got out of it when I got it - it arrived two days before the stated date in perfect condition and with a sling which was unexpected. The battery charger is for UK mains so I had no problem charging it which took around 4 hours. This gave it full charge but it will work after just a couple hrs on charge.
    The construction is solid polymer with a metal barrel and stock tube. The hi-cap mag is also plastic.
    I'm 6ft tall and at full extension, the stock happily fits me, though it would also fit someone taller.
    At full auto, it shoots at a relatively high rate of fire and a decent FPS.
    It's also accurate and I had no problem hitting tin cans from around 30 ft away.
    Overall, great buy and would highly recommend for a first 'proper' airsoft rifle.

  5. Solid All Round Starter Rifle 5 Star Review

    Posted by B. Chambers on 23rd Mar 2018

    So I bought this rifle with pretty low expectations given the relatively low price point when compared with most skirmish rifles.
    However, I was overall pleasantly surprised with the product
    Just to sort a few things out, as there are lots of different models of this rifle made by different companies with different materials. This exact rifle is made mainly from a really solid polymer with little to no flex. The metal components are the end of the barrel, the stock tube and sling attachment points.
    The shell ejection door is opened using the charging handle and allows access to the hop-up which is easy to adjust.
    This rifle shoots really hard, around 300 - 330 fps and easily made a few dents in a tin can. It also boasts an impressive level of accuracy although 0.2g pellets sometimes curve randomly at the end of their flight.
    Has a respectable ROF as well.
    -300 round mag
    -Comes with sling
    -comes with UK charger NOT EU so don't bother buying an adapter.
    Free shipping was fast and arrived in 3 working days, 2 days before the stated date.

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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