Specna Arms SA-B01 M4A1 Carbine Assault Rifle

Specna Arms
  • Adjustable Stock
  • Removable Carry Handle
  • Enter & Convert™ Spring System

Based off the standard M4A1 used by the US Army and Marines this rifle is a high quality replica built by Specna Arms with high levels of detail, finish, with a top quality wobble free design. If you're looking for a high quality full metal rifle for a beginner weapon you're going to be hard pressed to find anything else in this price range of this quality.

Full description


Built by Specna Arms to the highest quality these weapons are alloy in all the right places, with an alloy buffer tube, receiver, sling plate, outer barrel and carry handle, with a polymer stock, pistol grip and hand-guard. The weapon features various trademarks and stickers which all add to the weapon's realism, with a US Navy insignia on the magazine well.

The receiver features a top 20mm RIS / RAS rail which is revealed once the carry handle has been removed allowing the attachment of a wide variety of sights and scopes, and is the perfect home for a holographic or red-dot sight. The receiver also features a rear buffer tube sling plate which allows a variety of single point slings to be attached, and is made from metal to ensure that it is durable enough to take all the rough and tumble that comes along with a days skirmish.

The hand guard is based on the traditional standard hand-guard for an M4A1, and is designed to split just like the real thing, and is also where the batteries are stored inside the weapon. The hand-guard can also be replaced with other standard type M4 hand guard, and if the front post sight and d-ring are removed supports a wide range of aftermarket hand guard.

Internally the weapon contains everything you would expect from a modern Airsoft replica and more, with Silver wiring for low resistance, a v2 front wired gearbox with quick change spring system, 8mm ball bearings and is compatible with most Ni-mh, LiPo and LiFe batteries. The weapon also features an adjustable hop-up system which is designed to add spin to the BB to add range and accuracy, and is fully adjustable to allow support for a wide range of BB weights.

This rifle is perfect for those Airsoft players who are looking for a traditional looking M4, but with plenty of strength and durability. This rifle is a perfect beginner weapon because not only is it excellent quality, but leaves plenty of room for external upgrades, with plenty of options for compatibility with aftermarket parts.


  • Built by Specna Arms
  • Based off the standard M4A1 used by the US Army
  • Electric powered Airsoft AEG
  • Removable carry handle to reveal a top 20mm RIS / RAS rail for sights and scopes
  • 14mm CCW threaded outer barrel for attaching Suppressors and Tracer Units
  • Rear QD sling loop mount point
  • Front bayonet lug
  • Front and rear sling loops
  • D-Ring held removable handguard
  • Adjustable Hop-Up unit for range and accuracy
  • Metal high capacity Hi-Cap wheel wound 300rnd Magazine
  • Adjustable Crane Style Stock
  • Enter & Convert™ quick change spring system
  • Compatible with Ni-Mh, LiPo, and LiFe batteries
  • Batteries stored in the handguard
  • Front wired Gearbox System
  • Silver wiring for minimal resistance
  • 8mm Ball Bearings with steel thread-wheels
  • Type 2 cylinder
  • Metal hop-up unit
  • Mock charging handle
  • Finger ridged pistol grip ergonomic design
  • Compatible with a wide range of Airsoft STANAG Magazine
  • Well weight balanced
  • RoHS Compliant
  • Wobble free, heavy duty construction
  • Branded:
    • 'MARINE ENV.M-4'
    • '5.56MM NATO'
    • 'S044053'
    • 'CAGE: 68407'
    • 'PART# 49672380'
    • 'SERIAL# SA2689'

Package Includes:

  • SA-B01 M4A1 Carbine Assault Rifle
  • Magazine
  • Iron Sight Carry Handle
  • ID Card Lanyard
  • Specna Arms Sticker Set
  • Instruction Manual



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. 310fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Screwdriver Icon
Included Items
  • Magazine
  • Instruction Manual
  • Iron Sight
Skill Level Icon
User Skill Level
Starter, Regular Player,

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 2.58kg
Weapon Length Collapsed
Length (Collapsed)
Weapon Length Extended
Length (Extended)


Colour Wheel Greyscale
Primary Colour
Colour Wheel Greyscale
Secondary Colour
Black, Tan ,
Two Tone Icon
Pre Two-Toned
Construction Icon
Weapon Construction External
External Construction
Gearbox Icon
Internal Construction

Weapon Specific

Power Source Icon
Powered By
Blowback Icon
Weapon Platform
M4 / AR15 / M16
Magazine Style Icon
Magazine Style
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
Finger Ridged Pistol Grip
Rail System Icon
Rail System
20mm RIS / RAS
Icon Stock Positions
Stock Setting
Sight Type Icon
Sight Type
Aperture Iron Sight
Sling Plate Icon
Sling Options


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, Wheel Wound, AEG,
Magazine BB Capacity
Approx. 300 Rounds
Magazine BB Fill Method
Fill Window
Magazine BB Fill Location

Electric Gun Specific Information

Gearbox Icon
Gearbox Version
V2 Gearbox
Wiring Icon
Gearbox Wiring
Front Wired
Spring Change Icon
Gearbox Quick Change Spring
Digital Trigger Icon
Gearbox Electronic Trigger
Split Gearbox Icon
Split Gearbox Design
Airsoft Motor Icon
Motor Type
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
Using 0.20g BB

Take this Airsoft gun to the next level!

Like this Airsoft Gun? Check out these awesome Products!