Arthurian Airsoft Excalibur Bastion (2021 Version)


The Excalibur Bastion is a versatile and ergonomic airsoft M4 with a removable break out compensator on the front.

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icon Description

Arthurian Airsoft Excalibur Bastion

The Arthurian Airsoft Bastion is a stunning weapon with great performance, build quality and features. It will make an awesome weapon for those of you wanting to do a modern-day special forces loadout.

At the rear of the Excalibur Bastion is the adjustable stock, which has QD sling mounts on either side. Further forward you will find the castle knut, that will allow you to remove the stock and access the quick change spring system.

At the rear of the body is a sling mounting plate for attaching single point slings to. It has a textured and sleek pistol grip and a working charging handle that will lock back the false golden bolt and allow you access to the hop unit. To release the false bolt you simply press the bolt release on the left-hand side and the bolt will return with a nice snap.

It also has a silver non-functioning forward assist. It also has flip-up adjustable iron sights.

The Excalibur Bastion has a Bastion handguard, which features both M-LOK and 20mm rails. At the rear of the handguard are two QD sling attachment points. Further forward of these are tapered sections on the sides and underside of the handguard to allow for a more comfortable hold of the rifle. Within these tapered sections can be found the M-LOK slots. Further forward are the 20mm rail segments and another two QD sling mounting points.

The rail segments and M-LOK slots give you excellent positions to attach torches, grips and other accessories. There is a full-length rail that runs along the top and provides you with plenty of space for attaching sights and PEQ boxes. On the underside at the front is a moveable pin, which allows you to attach and remove the Break Out flash hider with ease.

The Break Out flash hider attaches directly to the rail and gives it a cool modern look. However with the Break Out removed you can unscrew the 14mm CCW threaded flash hider on the barrel and attach items like suppressors and tracers and give the bastion that super cool special forces look.

You get great range and accuracy from the Excalibur Bastion as well as good trigger response and rate of fire. Running off a 7.4v Lipo will give you great performance out on the field. Combined with the handguard and Break Out flash hider, it makes a great all-around weapon for all types of play. All the Arthurian Airsoft rifles have been upgraded internally with a reinforced tappet plate, 15 metal tooth piston and 8mm bearing to give you better performance.

2021 Model

The 2021 model Excalibur Bastion now feature an inbuilt MOSFET into the trigger board and a rotary hop unit. MOSFETs help protect the trigger contacts from being burnt out when using 7.4v or 11.1v LiPo batteries, increases the efficiency of the battery allowing for more shots per charge and increase the overall performance of the gearbox with a slight increase rate of fire and snappier trigger response.

The rotary hop unit improves the stability of the hop and negates any chance of it coming loose as a result of vibrations. As a result, the hop will be more consistent and give you ore adjustment allowing for finer tuning for heavier BBs.


  • Full metal construction
  • Bastion 8″ M-LOK and railed handguard
  • 14mm CCW threaded outer barrel
  • Adjustable flip-up sights
  • Single-point sling plate
  • 6 QD sling mounting points
  • Adjustable stock
  • Removable Break out flash hider
  • Working bolt release and charging handle
  • Gold bolt plate
  • Silver forward assist
  • SHS hop unit
  • 8mm bearings
  • Reinforced tappet plate
  • 15 metal-toothed piston
  • Quick change spring gearbox
  • Comes with 300 round high-cap magazine
  • Runs off 7.4v Lipo
  • Firing modes: Safe/Single/Full auto
  • FPS: 330
  • Length (stock collapsed): 680mm
  • Length (stock collapsed): 770mm
  • Inner Barrel Length: 235mm
icon Brand

Arthurian Airsoft

UK-based airsoft brand Arthurian Airsoft offers quality guns, accessories and equipment for all levels of airsoft players – from beginners to veterans. All their weapons are tested in the factory, ensuring that your product is its best before it even arrives on your doorstep. Read More
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icon    Delivery Times and Costs View our Delivery Times and Costs

At Socom Tactical we aim to ship all orders same working Day During our working hours. All orders before 14:00 we aim to ship the same day. Shipments are shipped Monday, Wednesday, Thursday, Friday sadly due to no collections we are unable to ship Saturdays.

Pricing and Times

UK Mainland   £6 or Free on orders over £100

Europe   £10 - Delivery 3-7 working days (Excluding any customs delays)

Rest of the World   4- 14 Working Days (Excluding any customs delays)

Additional Time There May / Will be additional delays for Remote UK, Highlands and Islands, as well as Northern Ireland typically this, adds an additional 1-2 working day

UK Shipping Methods -   Typically most orders over £30 or 1kg are sent via DPD local Next Working Day delivery. You will receive an email and/or Text message from DPD with a 2-hour delivery window. Packages under 1kg or £30 will be shipped by Royal Mail First Class Tracking number can be viewed on your account

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