Product code:
  • Bolt Action
  • Fully Licensed Replica
  • Adjustable Cheek Rest

Fully licensed by McMillan, this bolt action 6mm BB Airsoft sniper rifle is a 1:1 scale replica of the US Marine Corps’ M40A3 sniper rifle, complete with accurate McMillan branding.

Full description


Part of ASG's SportLine Sl beginner's range, this is both a highly authentic Airsoft replica of the M40A3 rifle and an affordable bolt action Airsoft sniper rifle which boasts great perfomance out of the box. Based on a rugged military design which has seen service with the United States Marine Corps since 2001, the ASG M40A3 is a 1:1 scale spring powered bolt action Airsoft sniper rifle. 

Just like the real M40A3, this quality Airsoft replica from ASG features dual alloy and polymer construction. Accurate to the real design, the Airsoft M40A3 uses a lightweight and durable polymer stock, which holds the alloy barrel, receiver and bolt. To top it all off, the replica features fully licenced and accurate markings and branding from McMillan, making this Airsoft replica almost indistinguishable from the real thing. 

A 20mm RIS rail located on the upper face of the receiver allows users to attach a wide range of sights and scopes as they wish. The lower face of the handguard features a short section of 20mm rail, providing ample space to install tactical accessories such as a bipod or foregrip. User comfort can be improved thanks to the stock’s adjustable cheek rest and buttstock. The cheek rest can be raised or lowered without tools, to ensure that users are able to get the best possible eye relief when aiming, whilst the stock’s length can be adjusted to ensure that users can comfortably hold and aim the rifle. 

The rifle features an adjustable Hop-up unit, which makes a positive click when it is being adjusted, and allows for a wide range of BBs to be used, including heavy weight BBs designed specifically for use in sniper rifles. Straight out of the box the ASG M40A3 is an excellent performer on the Airsoft skirmish field, able to hold its own next to some of the more high end Airsoft sniper rifles. However, for those of you wanting to get the best possible performance, the M40A3 is completely upgradeable, and is fully compatible with ASG SSG aftermarket parts, such as replacing the barrel and spring to greatly enhance the gun’s range and accuracy. 

If you’re looking to get into sniping, either as a new Airsofter or veteran skirmisher, then the ASG M40A3 is a great place to start – for a sniper rifle in this price range, we think you’ll be pleasantly surprised by the performance. For anyone attempting to create a USMC marksman loadout from 2001-2015, then the ASG M40A3 is both an excellent and accurate choice.


  • Fully licensed by McMillan 
  • Based on the M40A3 sniper rifle used by USMC
  • Part of ASG's SportLine SL beginner range
  • Great performance for a great price
  • Top 7'' 20mm RIS / RAS rail for attaching sights and scopes
  • Lower 2.5'' 20mm RIS / RAS rail for bipods and accessories
  • Front and rear right side swivel sling mounts
  • Textured handguard and grip for enhanced grip
  • Adjustable cheek rest for perfect eye relief on your sight
  • Adjustable linear Hop-up unit for range and accuracy
  • Adjustable stock length via removable plates
  • Hop-up clicks on adjustment
  • Removable barrel cap for replacing with a suppressor adaptor
  • Trigger lock safety switch
  • 1:1 scale Airsoft replica
  • 27rnd spring loaded magazine
  • Can be upgraded with aftermarket SSG parts
  • Unique serial number
  • Branded:
    • 'ASG'
    • 'F'
    • 'Cal. 6mm BB'

Package Includes:

  • M40A3 McMillan Sniper Rifle
  • Magazine 
  • Instruction Manual
  • Stock Extension Plate Set
  • Unjamming Rod
  • Speed Loader
  • Allen Key Pair



Weapon Construction External
Weapon Type
Snipers 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. 364fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Included Items
  • Magazine
  • Instruction Manual
  • Cleaning Rod
  • Speed Loader
  • Allen Key
  • Stock Extension Plates
Skill Level Icon
User Skill Level

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 2.32kg
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 Stock with Alloy Outer Barrel, Bolt Housing, Pins, Screws and Internals
Weapon Construction External
External Construction
Gearbox Icon
Internal Construction

Weapon Specific

Power Source Icon
Powered By
Blowback Icon
Weapon Platform
Magazine Style Icon
Magazine Style
M40 Spring
Fire Select Icon
Fire Selector
PatrolBase | Fire Select Safe
Fire Select Icon
Variant Fire Selector
PatrolBase | Fire Select Safe
Shooter Configuration Icon
Shooter Configuration
Right Handed
Weapon Configuration Icon
Weapon Configuration
Bolt Action
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
Linear on the Left Side of the Barrel


Weapon Furniture Icon
  • Railed Receiver
  • Adjustable Cheek Rest
  • Harris Bipod Lug
Rail System Icon
Rail System
20mm RIS / RAS
Sight Type Icon
Sight Type
Sling Plate Icon
Sling Options

Magazine Specific

Magazine Type
Low Capacity , Spring Loaded, Sniper Rifle,
Magazine BB Capacity
Approx. 27 Rounds
Magazine BB Fill Method
Speed Loader
Magazine BB Fill Location

Product Testing Data

Notepad Icon
Test Description
Using 0.20g BB
Notepad Icon
Tested Using
ASG 0.20g Blaster 6mm BB x 3000
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.

You might also like

Other starter weapons to sink your teeth into...