Patrol Base
Product code:
  • PB Custom Build
  • Electronic Trigger
  • HBI 4'' Handguard

    An Airsoft 6mm BB Gun, custom built by Patrol Base with unique custom parts, based on the Scorpion Evo 3 A1 Airsoft AEG by ActionSports Games in Denmark. The Gun features a Heavy Duty Polymer Receiver, Stock, and Pistol Grip with Alloy Handguard, Charging Handle, Flash Hider, Outer Barrel and Internals, just like it's Real Steel counterpart and is even constructed from the same High Strength Polymer as the real thing.

    Full description


    Patrol Base | Airsoft ASG Scorpion Evo Banner Top

    The weapon has been highly modified for use with the custom HB Industries Handguard, with a modified Outer Barrel Assembly, Shortened Barrel, Rear Wired Gearbox, and Modified Receiver Design. The Handguard is a Real Steel Handguard designed for the real thing, and features a multitude of modern features, with its lightweight design and MLOK Rail Panels for adding extra attachments. Due to the nature of the Handguard, the weapon has been modified to allow the battery to be stored inside the Receiver, by first Rear-wiring the Gearbox, and then modifiying the Upper Receiver Plates to allow the battery to be stored above the Gearbox, underneath the rail. The Outer Barrel has also been shortened, along with the Inner Barrel, which is modified and pinned in place for a solid hold. The weapon as standard features a multitude of advanced features, which are made possible by the internal MOSFET which has been custom designed for the Scorpion, which allows for a Safe / Semi / Three Round Burst / Full Auto Fire selector. The weapon also features an Electronic Trigger for an instantaneous response, and Mag Empty Detection which prevents the weapon from firing when you run out of ammo. The Gearbox also features a Quick Change Spring System allowing you to change the FPS of your weapon quickly for the Game Site you are playing at. This is the perfect purchase for any Airsoft Skirmisher who is looking for the ultimate CQB weapon, which not only outperforms most weapons on the field, but is also way beyond competitive at outdoor skirmishes.

    Other Features: 

    • Patrol Base Custom Build AEG
    • Built In-House by our team of Workshop Technicians
    • Official Real Steel HB Industries Custom 4'' Handguard
    • Custom Modified Rear Wired EVO Handguard
    • Custom Modified Rear Battery Storage Compartment
    • Custom Modified Upper Receiver Plates
    • Custom Modified Outer Barrel Assembly
    • Upgraded to Deans Battery Connectors
    • Fitted Upgrade Spring
    • Modified Shortened Barrel
    • Build Costs Included
    • Quick spring change design
    • Internal Error Detecting MOSFET Computer System
    • Electronic trigger
    • Folding stock which locks in place
    • Full length top rail for large Sight, Scope and Magnifier
    • Three round burst capability
    • Mag empty detection which stops firing when magazine is empty
    • Functional Bolt Lock
    • Removable Sliding Stock
    • Reduce BB loss hop unit
    • Functional charging handle
    • Ambidextrous Design, making it usable by both Left and Right Handed Shooters
    • Fast reload
    • Battery monitoring
    • Failure detection
    • Crisp electronic trigger response
    • CNC Processed Gearbox
    • Quality Wiring
    • Built entirely in Europe
    • Receiver Forward sling mount can be switched to either side
    • Constructed from the same high-strength mil-spec polymer as the real steel weapon
    • Alloy V2 Parts Compatible Gearbox
    • Adjustable Hop-Up unit for increased Range and Accuracy
    • 6.03mm 147mm Tightbore Barrel
    • Threaded Outer Barrel for attaching Evo Thread Converter for Suppressors and Tracer Units
    • Supports all of the Evo Attachments Range
    • Branded:
      • 'CZ SCORPION EVO 3 A1'

    Package Includes:

    • CZ Scorpion Evo 3 A1 K Custom - Black
    • Ironsights
    • Magazine
    • User Manual

    Special Instructions:

    Patrol Base Custom Warranty

    This weapon is custom built by Patrol Base, and as such we handle the warranty. We will match the 12 month warranty which ASG Provide, for up to 12 months from the date of purchase.

    Battery Warning

    Please ensure that you use the battery recommended for the weapon. In this case the: NUPROL - 11.1v 1200mAh 20c EVO K Modified LiPo Battery which has been modified to fit the weapon. This is to ensure peak performance, as well as fitting.

    Upgrades and Repairs

    Should you need advice or information regarding the Scorpion Evo, or indeed any Airsoft Item, please feel free to get in contact with our ASG Certified Workshop Department by giving them a call on: 01484 644709.

    Quick Change Spring

    Please ensure that when removing the Gearbox Quick Release Spring Screw a standard Allen Key is used, as using a Ball Type Allen Key Head will damage the nut. 

    LiPo Use
    If you use a LiPo please ensure it is removed after Skirmishes as the battery will be trickle drained over time breaking the battery.

    Battery Insertion
    To insert the battery first unfold the stock, slide the battery into the receiver, then connect the battery, with the wires and connectors facing outward.


    The following is a short guide to troubleshooting your Scorpion Evo. The Electronic Control System in the Scorpion Evo can detect the following problems:

    • Low Battery
    • Short-Circuits
    • Mechanical Failures (Broken Gears etc.) 

    In the event of a failure the Evo will sound two audible beeps and then stop functioning.

    1. 1. First, disconnect the battery.
    2. 2. Check the battery if the battery is fully charged or damaged, and then try another battery.
    3. 3. Check for short-circuits, looking for water penetration, if so, place the gun in a dry place and let it dry out.
    4. 4. Check the wiring for damaged or exposure.
    5. 5. Check for mechanical damages (This should be carried out by a skilled Airsoft Technician).

    If the problem persists please contact us on: 01484 644709 and ask for the Workshop.

    If the gun does not sound any beep when connecting the battery or the gun stops functioning without sounding any beeps:

    1. 1. Check for disconnected motor plugs
    2. 2. Check for motor burn out

    If no audible sounds are emitted this usually means there is a problem with the motor or its connection as the motor emits the sound.

    Please note that it is safe to try reconnecting the battery several times as the Electronic Control System protects the gun from surge and spikes.

    Patrol Base | Airsoft ASG Scorpion Evo Banner Bottom



    Weapon Construction External
    Weapon Type
    Submachine Gun
    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. 345fps ± 10%, using 0.20g BB
    Site Legal Icon
    Site Legal, using 0.20g BB
    Included Items
    • Magazine
    • Instruction Manual
    • Ironsight Set
    Skill Level Icon
    User Skill Level
    Experienced Player
    Patrol Base - Warning Icon
    Patrol Base (Evo K)

    Weight and Dimension

    Weight KG Icon
    Weight (KG)
    Approx. 2.06kg
    Weapon Length Collapsed
    Length (Collapsed)
    Weapon Length Extended
    Length (Extended)


    Colour Wheel Greyscale
    Primary Colour
    Colour Wheel Greyscale
    Secondary Colour
    Two Tone Icon
    Pre Two-Toned
    Construction Icon
    Polymer exterior. Alloy handguard, charging handle & outer barrel assembly.
    Weapon Construction External
    External Construction
    Gearbox Icon
    Internal Construction

    Weapon Specific

    Power Source Icon
    Powered By
    Blowback Icon
    Weapon Platform
    Submachine Gun, CZ Scorpion Evo,
    Magazine Style Icon
    Magazine Style
    CZ Scorpion Evo
    Fire Select Icon
    Fire Selector
    PatrolBase | Fire Select Safe
    Patrol Base | Fire Select - Semi Automatic
    Semi Automatic
    Patrol Base | Full Automatic
    Full Automatic
    Patrol Base | Burst
    Weapon Safety Features Icon
    Safety Features
    Trigger Lock
    Shooter Configuration Icon
    Shooter Configuration
    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
    Pull charging handle to reveal hop adjust inside dust cover


    Weapon Furniture Icon
    • Railed Handguard
    • Folding Stock
    • Railed Receiver
    • Ambidextrous Magazine Release
    • Ambidextrous Fire Selector
    • MLOK Rail System
    • Ambidextrous Safety
    Rail System Icon
    Rail System
    MLOK Rail System
    Icon Stock Positions
    Stock Setting
    Sliding , Folding ,
    Weapon Length Extended
    Stock Positions
    2 Position
    Sight Type Icon
    Sight Type
    Light Enhancing Open Iron Sights
    Sling Plate Icon
    Sling Options
    Stock , Handguard , Receiver ,


    Icon Thread Type
    Outer Barrel Thread Type
    Icon Thread Direction
    Outer Barrel Thread Direction
    CCW (Counter Clockwise)
    Outer Barrel Thread Size
    Inner Barrel Diameter
    Inner Barrel Length

    Magazine Specific

    Magazine Type
    Medium Capacity , AEG,
    Magazine BB Capacity
    Approx. 75 Rounds
    Magazine BB Fill Method
    Speed Loader
    Magazine BB Fill Location

    Electric Gun Specific Information

    Wiring Icon
    Gearbox Wiring
    Top Wired
    Battery Specific
    Battery Connector
    Patrol Base | Icon | Deans
    Suggested Battery
    Suggested Battery Type
    Suggested Battery Configuration
    Suggested Battery Voltage

    Product Testing Data

    Notepad Icon
    Test Description
    Notepad Icon
    Tested Using
    Blaster 0.2g BBs

    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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