Specna Arms
Product code:
  • Ultra Compact CQB M4
  • Enter & Convert System
  • Specna Arms Gearbox

Built by Specna Arms this rifle is an ultra compact Airsoft AEG based on the M4 platform, and is designed to be short enough to easily be used in CQB environments and low-profile engagements.

Full description



The rifle is part of Specna Arms 'A' Range of rifles, which are built as high quality replicas perfect for mid-range players. The rifle itself is an Airsoft electric powered AEG which uses a gearbox and motor system to fire BBs from the weapon in both semi-automatic and fully automatic fire modes. All that is required to make the weapon function is BBs and a battery, and you're ready to rock and roll.

This rifle is designed to be as compact as possible, making it great for CQB game play, or for those who like a rifle with a low profile. The rifle features all the standard features of an M4 rifle, but with a shortened barrel, hand guard and custom flash hider.

The hand guard and the outer barrel are shortened to make the rifle as short as possible but without compromising on functionality.

As standard, the rifle's flash hider is removable to reveal a 14mm CCW threaded outer barrel to allow a wide range of aftermarket silencers, suppressors and even tracer units to be attached. Just make sure you remove the securing grub screw first which holds the flash hider in place.

The hand guard itself features a four-point 20mm RIS / RAS rail, meaning the hand guard has rails at the 3, 9, 6 and 12'o'clock positions, with 20mm RIS / RAS being the most common type of attachment standard in the Airsoft market today. The bottom rail could be used for attaching grips, bipods (though not really needed on this rifle) or even launchers, torches and lasers on the sides, and possibly even a red-dot or light module on the top.

The weapon's receiver is also railed with a 20mm RIS / RAS rail for attaching sights and scopes, and comes pre-fitted with removable flip-up iron sights which can be used should you not have a main sight on the weapon. The sights are fully adjustable for windage and elevation, and can be laid flat when not in use.

The rifle features multiple functional mock parts, with a functional charging handle, dust cover and mock bolt plate, which when pulled to the rear reveal the weapon's hop-up unit. A nice touch for added realism.

The gun features a hop-up unit, standard to most modern Airsoft AEG, and is designed to add range and accuracy to your shots. The hop-up works using a rubber contact patch which applies spin to the BB as it passes through the hop unit to displace the air around the BB to create lift. The hop-up unit is fully adjustable and can be used with a wide range of BBs, all the way from 0.20g to 0.28g BB and above.

The rear of the rifle features an adjustable crane stock, which is designed to also hold the battery. The rear butt plate is removed to reveal the battery compartment and fits both Ni-Mh and LiPo crane stock batteries. For those who love to run slings there is also an ambidextrous rear sling plate for single point sling setups with a range of different third party slings.

Internally the rifle features a rear wired V2 gearbox, one of the most common in Airsoft meaning endless possibilities when it comes to upgrades, and is rear wired to allow the battery to be connected in the stock. The gearbox itself comes fitted with some excellent quality parts which gives the rifle a competitive edge against other similarly priced weapons on the market.

The gearbox features Specna Arm's Enter and Convert system, which is essentially a quick change spring gearbox system. This allows you to quickly and easily swap the spring to a higher or lower powered unit to increase or decrease the FPS of your weapon by removing a large screw at the back of the gearbox. This allows you to adjust the power of the rifle to the site you wish to play at without having to take the gearbox entirely apart.

The rifle's gearbox also contains some high quality parts, including reinforced steel gears to increase the lifetime of the weapon, along with a steel spring guide, lightweight polymer piston and aluminium piston head for optimal performance. The gearbox also features 8mm ball bearings and an air sealed metal nozzle which help the weapon run smoother and more consistently for longer.

This rifle is perfect for those Airsoft skirmishers who are looking to grab themselves a new CQB rifle, or for those who want a weildy weapon which is not to big and easy to carry.



  • Part of Specna Arms 'A' Range of rifles
  • Airsoft electric powered AEG
  • Powered by Airsoft LiPo / Ni-Mh batteries
  • Safe / Semi / Full Automatic Firemodes
  • Ultra compact CQB M4
  • Custom flash hider
  • 14mm CCW threaded outer barrel
  • Four point 20mm RIS / RAS Rail for grips and attachments
  • Removable 20mm RIS / RAS flip-up ironsights
  • Ironsights are adjustable for windage and elevation
  • Functional mock charging handle and bolt release
  • Adjustable Hop-Up unit for range and accuracy
  • Ambidextrous sling palate for left / right handed single point sling setups
  • Finger ridged pistol grip
  • Flat trigger guard
  • Rubberised butt plate
  • Mock gas tube
  • Mock forward assist

  • Six position adjustable Crane Stock
  • Stock used as a battery compartment
  • Specna Arms branded Version 2 (V2) Gearbox system
  • Rear wired gearbox
  • Enter and Convert Quick spring change system
  • Reinforced steel gears
  • Steel spring guide
  • Lightweight polymer piston
  • Aluminium air sealed piston head
  • Metal cylinder head
  • Air sealed metal nozzle
  • 8mm ball bearings
  • Numbered Rails
  • Branded:
    • 'MARINE ENV.M-4'
    • '5.56MM NATO'
    • 'S 0188674'

Package Includes

  • SA-A06 Carbine M4 SBR
  • Instruction Manual
  • 300rnd Hi-Cap Magazine
  • Ironsight Set

Special Instructions

When removing the flash hider please ensure you first remove the small grub screw located at the bottom which locks the piece in place. Also take care when removing the mock gas tube as the flash hider / gas block is a single unit.




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. 340fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Screwdriver Icon
Included Items
  • Magazine
  • Instruction Manual

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 2.45kg
Weapon Length Collapsed
Length (Collapsed)
Weapon Length Extended
Length (Extended)


Colour Wheel Greyscale
Primary Colour
Black, Half-Tan,
Colour Wheel Greyscale
Secondary Colour
Two Tone Icon
Pre Two-Toned
Construction Icon
Alloy Receiver, Handguard, Barrel, Flash Hider, Sight Set and Buffer Tube, with a polymer 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
Weapon Scale Icon
Weapon Scale
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
Adjustable behind mock bolt plate when charging handle to the rear.


Weapon Furniture Icon
  • Railed Handguard
  • Flip-Up Ironsights
  • Railed Receiver
  • Finger Ridged Pistol Grip
  • Adjustable Stock
Rail System Icon
Rail System
20mm RIS / RAS
Icon Stock Positions
Stock Setting
Weapon Length Extended
Stock Positions
6 Position
Sight Type Icon
Sight Type
Aperture Iron Sight
Sling Plate Icon
Sling Options
Buffer Plate

Magazine Specific

Magazine Type
High Capacity, Wheel Wound, AEG,
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
Split Gearbox Icon
Split Gearbox Design
Airsoft Motor Icon
Motor Type
Battery Specific
Battery Connector
Patrol Base | Icon | Mini Tamiya
Mini Tamiya
Suggested Battery
Suggested Battery Type
Suggested Battery Configuration
Suggested Battery Voltage

Product Testing Data

Notepad Icon
Test Description
Using 0.20g BB
Notepad Icon
Tested Using
Blaster 0.20g BBs
Notepad Icon
Test Date

Delivery & returns

Postage Estimates

Below are some rough postage prices for orders. Please note these are subject to change, and are only a rough guide. For more accurate postage estimate please use the Postage Calculator at the basket.

UK Standard



UK Next Day



Highlands / Islands






* Please note that Scottish Highlands, Islands and EU post prices can vary wildly. Prices range from £8.99, up to £29.99, so please ensure you refer to the Postage Calculator at the basket for the lowest possible price.


For more detailed information please see our Delivery Information.

We are proud of our rapid delivery which, comprises of Royal Mail 1nd class recorded and courrier next working day to mainland UK. We also ship to EU countries; Scottish Highlands and Islands which are a minimum of a two day service and are shipped by land / sea. Our deliveries are made by DPD and Royal Mail recorded 1st or 2nd class signed for, and Royal Mail Standard.

We deliver from Monday to Friday, and Saturday with a special service. If more than 7 days have passed since we confirmed dispatch and your order has not arrived, then please call our Customer Care team on 01484 644709. If we don’t have stock of an item then we will call and email you letting you know that it is out of stock, and we will send it to you as soon as stock becomes available. If you want to cancel any item/s that are out of stock once order you can. For most UK deliveries postage & packing is based upon the value, size and weight of your order.

We always look to fulfil every order in full on time, but on the odd occasion an  item is missing we will attempt to contact you prior to shipping. If your order is a Next Day service, and we cannot contact you, we will refund the missing item(s), and ship the rest of the order immediately.

Upon signing for the delivery you are accepting the correct delivery for your items, however, we do understand that you might not be able to open your package straight away so you have up to 48 Hours to advise us of missing / incorrect items.

Please note we do not compensate in any way for time spent waiting in for deliveries that do not arrive, we do however accept that in life, mistakes and circumstances happen that can unfortunately mean that your item may not be delivered next day as requested e.g. bad weather, computer error etc. If such mistakes do occur we will refund your postage charge in full and by agreeing to the previous sentence and proceeding with the order you accept that we have done everything we can to help you obtain the package.

For orders outside of the UK Mainland please specify your location when calculating postage. 

For all international orders there may be an additional postage charge on top of that quoted. You will be contacted if this applies for your order. If the postage costs are too high, you may cancel your order at any time prior to dispatch.


For more detailed information please see our Returns Policy Page.

You can cancel any order that has not been dispatched. Please call our Customer Care team on 01484 644709 between 9:30am and 5:00pm or log onto the website and check the status of your order in your account.

If you do want to arrange the return of an item, simply call our friendly Customer Care team on 01484 644709 from 9:30am to 5:00pm and they will explain how to return the items.

Alternatively you can get in touch with us via our Contact Us Page.

If you are returning a product because it is faulty or something is wrong then we will pay for it to be returned to us. The Customer Care Team will arrange for cost you incur to be refunded.

You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.

We want you to be absolutely happy with our products and services, so we provide the simple Patrol Base guarantee:  if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.

This guarantee ensures that if you are unsure about what you are purchasing you have the peace of mind of knowing that we are here to help. In addition, if you decide that you made a mistake or you change your mind then please send the goods back within 14 days of receipt. Sadly, this can only apply to standard range products; we cannot accept back any item that has been made to order i.e. Two Tone Airsoft equipment.

Upon signing for the delivery you are accepting the correct delivery for your items, however, we do understand that you might not be able to open your package straight away so you have up to 48 Hours to advise us of missing / incorrect items.
If you do decide to return anything for whatever reason then please get in touch with us via our Contact Us Page for a copy of our returns form.

If you do send goods back for any reason other than a fault you will normally be asked to pay the carriage charges, we would just have to recover the costs in our prices. We would rather be completely straight with you, keep our prices as low as possible, and just ask you to pay if you choose to return anything.

Any none faulty return must be shipped back in full re-saleable order with original undamaged packaging.

Finance options

Looking to buy an Airsoft replica, but don't want to drop all your money at once? Perhaps you want to spread your payments over time to keep a backup of money, or perhaps you simply can't afford the hit right now and want to spread it over time? In any case you can spread your payments to take away the pain of the initial hit of the purchase of a replica, or give yourself the ability to spend that little bit more and get that rifle you've always wanted!

Want to know more about Airsoft Interest Free Finance?
You can check out our Airsoft Finance Info Page for more details >

Here at Patrol Base we have partnered with Omni Capital Retail Finance, allowing you to buy now pay later with ease.

You can select finance during the payment process which will take you to the Omnicapital portal and allow you to complete a credit check at your leisure. Once your finance is accepted you will be able to complete your order and wait for the goods to arrive!

Wondering how much it's going to cost?
Check out the examples below.

Looking to make the jump from BB guns to Airsoft, but don't want to save up to buy your entire loadout? Your time has come!

Airsoft replicas are leaps and bounds ahead of BB guns, but can sometimes carry a heavy price tag. You can spread the cost with us to save the strain on your wallet to allow you to buy your entire loadout at once, rather than piece by piece. Play now, pay later.

Want to know exactly why Airsoft Replica are so much better than BB Guns? Check out our BB Guns Page.

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