Army Armament R604 Gas Blowback Pistol

Army Armament
Was £119.99
Save £15.00
  • Compensator
  • 20mm Pistol Rail
  • Light Enhancing Sight

The Army Armament R604 is a Gas Blowback Airsoft Pistol based on the Hi-Capa frame, which is known for its good gas performance due to large Magazines. The lightweight Slide also benefits the Pistol's performance, by having less weight to move around, giving it a snappy Trigger Response and better cold weather performance than standard.

Full description


The R604 is constructed with an Alloy Slide and Frame, which gives it a realistic weight and makes it very tough. The Pistol Grip covers are Polymer as you would expect, but have been Stippled to provide excellent Grip even when wearing Gloves. The Flared Magwell Extension Piece makes for much faster reloads, helping to guide the Magazine into the right position, and can be removed if you so wish.The Slide is a ventilated design which looks great, and also helps reduce overall weight. A gnarly looking Compensator sits on the front of the Pistol and looks exceptionally cool when the Slide is cycling. Underneath the frame you will find a 20mm Pistol Rail which can be used to install an accessory such as a Torch, Laser or Mini Grenade Launcher. A Beavertail Safety sits on the Pistol Grip, and won't let the Pistol fire unless it is being gripped properly. The Extended Magazine Release is threaded, allowing you to install extension plates if you want a larger button. The Pistol features an Adjustable HOP Unit, which is accessed by removing the Top Slide completely. To do this, line up the smaller cutout on the Slide with the Slide Release, push the Slide Release out completely and pull the Slide off the Frame forwards. Reverse these steps to re-install the Slide. The HOP Unit will apply backspin to your BBs, and by using heavy BBs (0.25g+) and the correct settings, you can theoretically improve range and consistency.

The Top Slide of the Pistol features High Profile Ironsights, which are very useful if you choose to use the included Sight Mount Plate to install a Red Dot Sight on the Slide. This included mount can be used to replace the plate on the Top of the Slide to install a standard Compact Red Dot Sight. The High Profile Ironsights are so that they can still be used if you have a Sight mounted to the Slide.

Included in the box is a 28rnd Gas Magazine, a User Manual and the R604 Pistol itself. If you're looking for a snappy and responsive Hi-Capa Platform that is made to a tough standard and can have a Red Dot Sight installed, then the Army Armament R604 is a good choice.


  • Gas Blowback Airsoft Pistol
  • Realistic Recoil Action
  • Hi-Capa Platform Pistol
  • Alloy Construction
  • Stippled Pistol Grips
  • 20mm Pistol Accessory Rail
  • Vented Slide Design
  • Compensator on Muzzle
  • Light Enhancing Front Sight Post
  • High Profile Ironsights
  • Can Accept Red Dot Sight
  • Sight Mount Plate Included
  • 28rnd Gas Magazine
  • Threaded Magazine Release
  • Beavertail Safety
  • Skeletonised Trigger & Hammer
  • Flared Magazine Well
  • Snappy, Responsive Slide

Package Includes

  • Army Armament R604 Gas Blowback Pistol
  • 28rnd Gas Magazine
  • User Manual

Special Instructions

The externals of the replica are metal where they would be on the real world gun. This includes things like the outer barrel, handguard, and receiver. If a real world gun has polymer parts then the gun will still be marked as full metal externals, examples of this would be an M4, where the Stock and Pistol grip are always made from Polymer.



Weapon Construction External
Weapon Type
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. 309fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Included Items
  • Magazine
  • Instruction Manual
  • Sight Mount
Skill Level Icon
User Skill Level
Starter, Regular Player,

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 1.03kg
Weapon Length Collapsed
Length (Collapsed)


Colour Wheel Greyscale
Primary Colour
Two Tone Icon
Pre Two-Toned
Construction Icon
Alloy slide, frame and trim. Polymer pistol grip.
Weapon Construction External
External Construction
Gearbox Icon
Internal Construction

Weapon Specific

Power Source Icon
Powered By
Green Gas
Blowback Icon
Gas Blowback
Weapon Platform
Magazine Style Icon
Magazine Style
Fire Select Icon
Fire Selector
Patrol Base | Fire Select - Semi Automatic
Semi Automatic
Weapon Safety Features Icon
Safety Features
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
Remove slide to access


Weapon Furniture Icon
  • Light Enhancing Iron Sights
  • 20mm Pistol Rail
  • High Profile Ironsights
  • Flared Magwell
  • Stippled Grip
  • Vented Slide
Rail System Icon
Rail System
20mm Pistol Mount
Sight Type Icon
Sight Type
Iron Sights


Inner Barrel Diameter
Inner Barrel Length

Magazine Specific

Magazine Type
Magazine BB Capacity
Approx. 28 Rounds
Magazine BB Fill Method
Speed Loader
Magazine BB Fill Location
Top, Bottom,
Magazine Gas Fill Location
Magazine Gas Type
Green Gas

Gas Gun Specific

Gas Can Icon
Gas Compatability
Green Gas
Gas Can Icon
Gas Recommendation
Green Gas

Pistol Specific

Construction Icon
Slide Material
Icon Pistol Slide
Pistol Slide Type

Product Testing Data

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

Detailed Power Tests

FPS, using 0.20g BB
Approx. 309fps, using 0.20g BB

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