King Arms - M4 Striker Keymod (Ultra Grade)

AEG Rifles - King Arms

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  • Regular price £189.99
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This M4 airsoft gun replica by King Arms is truly an airsoft gun you want in your arsenal! This full length version with long barrel and keymod hand-guard is the perfect companion for your airsoft skirmishes. 

The M4 striker is the ultra grade addition and is packed with features such as a long keymod rail system for your attachments, in-built MOSFET and an optional tactical front grip. This airsoft gun offers a huge amount of rail space for attaching scopes, PEQs, torches and more! The large stock tube accommodates a large variety of different sized batteries meaning you can use higher capacity batteries in your gun which will keep you in the game for longer. This gun works great straight out of the box, meaning you don't have to waste any time modifying the gun and can take it straight out on the airsoft field.

The gun also has popular features that are present in other models of the King Arms range such as a quick change spring system, flip-up iron sights, 6.05mm brass barrel and underneath the flash hider a 14mm CCW thread for attaching tracer units or other suppressors to the gun. 

Made from durable polymer and metal this gun has the reliability you expect from an ultra grade airsoft gun. Whilst a full length barrel, adjustable hop-up and adaptable stock makes this gun perfect for CQB and longer range outdoor skirmishes.

Whether you are a beginner or veteran and looking for a full length M4 airsoft gun for CQB and outdoor skirmishes then this is the gun for you!


  • Full scale 1:1 replica
  • Keymod and picatinny rails for attachments
  • Version 2 gearbox with 7mm bearings
  • MOSFET built in
  • Single shot and full-auto fire settings including safety
  • Vertical design trigger for improved shooting flexibility
  • Flip-up front and rear adjustable sights
  • Adjustable hop-up
  • 6.05mm brass barrel
  • Quick change spring system
  • Adjustable quick pull auto-locking 7-position stock
  • Large stock tube for holding batteries
  • Accepts most after-market M4 magazines


Included with the gun:

  • 1 x M4 TWS 140 round capacity magazine
  • TWS front grip (not shown in pictures)



King Arms

Model Name

M4 Striker Keymod (KA-AG-228-BK)


6.0 mm

Weight and Scale

2.70 kg – 1:1

Magazine Capacity

140 Rounds

Powered By

Electric motor (AEG)

Recommended Energy Source

7.4V Li-Po Battery


Zinc-Alloy and Nylon Fibre

Safety and Fire Modes

Safe, semi-automatic and fully automatic

Adjustable Hop-Up


Hop-Up Adjustment Location

Pull back charging handle - behind mock bolt 

Velocity (feet per second/FPS)

~ 306fps ± 10%, using 0.20g BB

Rate of Fire (rounds per minute)

Approx. 1280