BOLT B4 M16A4 Heavy

  • 14mm CCW Thread
  • Large Battery Space
  • Heavy Recoil System

A solid and sturdy replica of the infamous M16 platform, in its' glorious A4 format with a 20mm railed handguard, removable carry handle and solid stock. It also features a strong mechanical recoil in the form of the Bolt Recoil Shock System.

Full description


This Airsoft Electric Gun is a rock solid and beautiful replica of the M16A4 platform which features a 20mm railed handguard and fixed solid stock, which offers a huge battery space to fit almost any size battery. The outer barrel assembly, handguard, receiver and various trim aspects are made from a combination of Alloy, Aluminium and Steel for a long lasting finish which provides a realistic weight, feeling extra-incredible when combined with the vicious recoil. Where Polymer has been used (pistol grip and stock) they are a high density Nylon Fiber which is a tough, quality material that feels great to the touch.

The RIF is a rear-wired design, and houses a Mini Tamiya connect at the rear of the stock. The fixed stock offers a massive amount of battery space and can accommodate pretty much any battery, however we recommend a 7.4v LiPo Stick battery. To access the battery compartment, simply open the hinged door by pulling down on the tab. The stock and handguard have traditional loops for the addition of standard slings. The handguard and receiver are 20mm railed which allows you to attach all manner of accessories, to build your dream AR platform rifle. Simply remove the carry handle to access the top rail. Underneath the Alloy-constructed flash hider is a 14mm CCW thread should you wish to install your own suppressors, tracer units and other muzzle devices. There is an outer barrel extension included in the box to keep the box size smaller, but allows you to run the RIF a little shorter should you wish.

The Bolt Recoil Shock System (or BRSS) is the beating heart of what makes these replicas awesome, and provides a heavy, weighted recoil when you pull the trigger. This gives the user a strong recoil effect without having to mess around with gas systems which can be unreliable. The replica features a reinforced Piston which actuates an ERG style recoil mechanism in the rear of the RIF, delivering a strong kick into your shoulder every time the replica cycles. This means you get to enjoy the joy of realistic recoil, with the benefits of high capacity magazines and consistent performance. Unlike traditional 'recoil systems' which simply move the dust cover backwards and forwards, this style of recoil involves a weighted piston moving around at the rear, which brings a whole new level of realism, and feels incredibly satisfying.

If you want an incredibly well-made replica of the M16A4 platform, which has a very heavy recoil system, railed handguard and receiver and will put a massive smile on your face every time you pull the trigger, then the Bolt B4 M16A4 Heavy is a great choice for you.


  • Bolt Recoil Shock Series
  • AR Platform M16A4 Replica
  • Full-Length AR Platform
  • TM Compatible
  • Steel Gears
  • Rotary HOP Unit
  • 20mm Railed Handguard
  • 20mm Railed Receiver
  • Removable Carry Handle
  • 14mm CCW Thread
  • Outer Barrel Extension
  • Rear Wired / Mini Tamiya
  • Fixed Solid Stock
  • Rail Slot Markings
  • 300rnd High Cap Magazine
  • Tough Exterior Build Quality
  • Birdcage Style Flash Hider
  • Nylon Fiber Polymers
  • Traditional Front & Rear Sling Loops
  • Fabric Patch Included
  • Hard Mechanical Recoil

Package Includes:

  • Bolt B4 M16A4 Heavy
  • 300rnd High Cap Mag
  • Outer Barrel Extension
  • Instruction Manual
  • Fabric Patch
  • Sticker



Weapon Construction External
Weapon Type
Assault 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. 320fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Included Items
  • Magazine
  • Instruction Manual
  • Barrel Extension
  • Fabric Patch
  • Sticker
Skill Level Icon
User Skill Level
Regular Player, Experienced Player,

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 3.35kg
Weapon Length Collapsed
Length (Collapsed)
Weapon Length Extended
Length (Extended)


Colour Wheel Greyscale
Primary Colour
Black, Tan ,
Colour Wheel Greyscale
Secondary Colour
Two Tone Icon
Pre Two-Toned
Construction Icon
Alloy outer barrel assembly, handguard, receiver, sights and trim. Polymer pistol grip & stock.
Weapon Construction External
External Construction
Gearbox Icon
Internal Construction

Weapon Specific

Power Source Icon
Powered By
Blowback Icon
Electro Mechanical Blowback
Weapon Platform
AR Platform, M4 / AR15 / M16,
Magazine Style Icon
Magazine Style
STANAG, AR Platform,
Fire Select Icon
Fire Selector
PatrolBase | Fire Select Safe
Patrol Base | Fire Select - Semi Automatic
Semi Automatic
Patrol Base | Full Automatic
Full Automatic
Weapon Safety Features Icon
Safety Features
Trigger Lock
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
Adjustable behind dust cover


Weapon Furniture Icon
  • Railed Handguard
  • Fixed Stock
  • Carry Handle
  • Outer Barrel Extension
Rail System Icon
Rail System
20mm RIS / RAS
Icon Stock Positions
Stock Setting
Sight Type Icon
Sight Type
Iron Sights
Sling Plate Icon
Sling Options
Stock , Handguard , Loop ,


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

Magazine Specific

Magazine Type
High Capacity, AEG,
Magazine BB Capacity
Approx. 300 Rounds
Magazine BB Fill Method
Fill Window
Magazine BB Fill Location

Electric Gun Specific Information

Wiring Icon
Gearbox Wiring
Rear Wired
Battery Specific
Battery Connector
Patrol Base | Icon | Mini Tamiya
Mini Tamiya
Suggested Battery
Suggested Battery Type
Suggested Battery Configuration
Suggested Battery Voltage

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. 320fps, using 0.20g BB

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