Specna Arms SA-J73 AK-105 CORE™ Carbine AEG

Specna Arms
Code:
129.49
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  • 6.03mm Tightbore inner barrel
  • High density polymer receiver
  • A lightweight modern AK platform

If you are looking for an AK that doesn't weigh double what an M4 does but is also suitable for a modern Russian loadout, you just found one! The SA-J73 is a near perfect replica of the AK-105, the prettiest AK out there in our opinion. This AK uses the VFC style of external construction, meaning pins and rivets instead of screws, a realistically slim side folding stock and as close as is possible to realistic disassembly with an AEG.

The SA-J73 weighs a mere 2.5kg approximately, and Specna gets away with this with a high density polymer receiver, gas tube and gas block which has the added benefit of increasing the rifle's resistance to scratches. We have been waiting for a modern AK in the featherweight category, and finally, it is here!

Full description

Description

If you want an AK but you don't want to be at the gym constantly, maybe a full steel model isn't for you. The SA-J series from Specna Arms is designed for this exact purpose, giving you modern AK designs with realistic field stripping, based on the VFC AK design externally but with polymer parts to keep the weight down, and Specna's respectable CORE internals to get the job done down range. The SA-J73 is modelled after the AK105, a mid-length AK design regularly fielded by Spetsnaz troops for a variety of operations, and is the perfect length to both cut corners in CQB and reach out and touch the enemy at long range.

Starting at the tip of the barrel we can find an AK-105 style gas booster muzzle brake, which is intended in the real AK-105 to direct additional gas back into the operating mechanism to ensure the AK-105 keeps the AK typical reliability with its shortened barrel. The muzzle brake mounts to 14mm CCW male threads at the tip of the 12 inch outer barrel and can be swapped out for a suppressor or tracer unit if you are going for more of a Spetsnaz look for your AK.

The gas booster mounts via a 24mm Russian thread adapter which has a grub screw to retain it so if you need to access the 14mm CCW male threads on the barrel you will need to hold the detent pin on the front of the front sight block, unscrew the gas booster and remove the grub screw from the adapter beneath, after which it can be unscrewed to reveal the 14mm CCW threading.

The front sight of the SA-J73 is integrated into the gas block,  providing an adjustable front post with protective wings to ensure an accidental bump or scrape does not render your sights useless. This connects to the gas tube, which is the correct design for an AK-105 and it looks awesome. The handguards of the SA-J73 are styled after the standard AK-74 polymer type, with linear grooves for additional grip. These handguards match perfectly with the post-Bakelite era AK furniture, such as the side-folding solid stock and shortened AK-105 length outer barrel.

The lower handguard surrounds the alloy outer barrel and is retained by its own handguard cap which includes a sling point on the left side, ideally for hook-type slings. The trunnion block also provides the mounting point for the classic AK tangent rear iron sight, which provides multiple graduations for adjustment and a fine rear sight notch to align with the front sight post. The sight can be adjusted by pressing the buttons on either side of the sight notch and moving the notch back and forth on its base.

The lever on the right side of the trunnion is the handguard and gas tube disassembly lever. This lever allows you to quickly remove the upper handguard and gas tube of the SA-J73 just like a real AK-105, though this isn't really any use in Airsoft terms. This is one of the many perks of using the VFC style external construction over the TM style, you can strip it like a real AK for extra nerd points!

As part of the classic AK aesthetic, we can find a dummy cleaning rod running parallel to the outer barrel, stored on the weapon to give the Russian soldier less to remember! This isn't intended for cleaning an Airsoft barrel and is just for the look but is constructed from steel with a gunmetal finish applied, providing a bit of subtle contrast to the overall design.

Next up we find the receiver, which is constructed from Specna's high density polymer, the same stuff used on their CORE and FLEX M4 series. This polymer is firm and flex free, and has a matt textured surface which almost looks like the real anti corrosion finish applied to real AKs. This is one of those receivers you have to touch to know it isn't metal!

The receiver has standard AK style controls on the right side, with a fire selector lever which doubles as a dust cover when in safe mode, and a charging handle attached to an authentic black dummy bolt carrier. In typical AK style, the first position on the fire selector is fully auto and the lowermost position is semi-automatic. Each fire mode is denoted by a crispy moulded authentic Russian Cyrillic marking, adding some realism to this already very realistic AK.

Over on the left side, we can find an AK quick detach mounting rail, allowing for authentic Russian scopes to be mounted, or Picatinny rail mounts if you prefer a more modern western optic. The receiver also provides several authentic dummy rivets, all found in the correct place for this AK variant. On the underside of the receiver we can find a discretely located "SA in a box" Specna Arms logo, just forward of the magazine well. The magazine well also has an insert at the front which helps with reloads by limiting how far the mag can go into the receiver. This is a great feature, and makes the SA-J73 less of a pig to manipulate than most AKs!

To access the adjustable HOP-up unit of the SA-J73 simply hold the charging handle to the rear to reveal the slider adjustable HOP unit. The slider unit is known as one of the best designs out there, and that is the reason this unit has not changed in design since the original Tokyo Marui AK-47 AEG. To increase the HOP effect, simply move the slider rearwards. Returning the slider to the front will reduce the HOP to its lowest setting. The HOP-up unit is constructed from alloy to give it extra strength.

The receiver top cover of the SA-J73 is also constructed from stamped steel and is the appropriate design for a modern AK, with ribs stamped into the upper surface to provide additional strength whilst keeping the material thin and lightweight. The battery compartment for the SA-J73 is beneath the top cover. To access the battery compartment, simply press the button at the rear of the top cover and it should come straight off, revealing the mini-Tamiya connector. For the SA-J73 we recommend a 7.4V 1450mAh stick battery but you can also use a 9.6V NiMH stick battery if you prefer a NiMH battery. With the battery connected and installed, you can place the top cover back into the rifle, align the button with the hole in the rear of the top cover, and pull the charging handle to lock the cover down if necessary.

The pistol grip of the SA-J73 is a standard AKM/AK-74 type pistol grip, with diamond checkering on either side to ensure the rifle stays firmly in your grasp in any weather condition. The trigger guard and magazine release can be found just ahead of the pistol grip, and are constructed from steel to provide solid magazine locking and ample rigidity. The magazine release is placed in the centre of the receiver and is accessible from either side of the AEG. The magazine retention system of the AK platform is a "rock and lock" motion, requiring you to first index the front "hook" on the magazine inside the receiver, then rock the magazine to engage the catch.

The stock of the SA-J73 is constructed from polymer, and is a realistically slim design to facilitate side folding functionality. The stock features a storage compartment within its butt plate, which can be opened using the large polymer button on the butt plate. This compartment is rather small and is intended for a cleaning kit, but could also be used to store batteries for any accessories on your AK, or any documentation you might need. To fold the stock to the side, simply press the button on the left side of the rear of the receiver, fold the stock to the left side and lock it on its hook. To unfold the stock, press the button on the butt plate to disengage the hook, and the stock can be folded into the deployed position and locked. The right side of the stock also features a sling loop which pairs well with the front sling point on the lower handguard cap, providing appropriate mounting apparatus for a two-point sling, but ideally suited to an AK47/74 sling.

Features

  • High density polymer/alloy/steel build
  • 6.03mm Tightbore inner barrel
  • 14mm CCW male threaded barrel w/24mm Russian adapter
  • Alloy slider adjustable HOP-up unit - Great design, very effective
  • ESA2 Quick change spring system -Easy power tuning, no need to open the gearbox
  • Version 3 Gearbox - Alloy shell, steel gears, 8mm slide bearings
  • Ambidextrous magazine release - Centrally positioned, great for lefties
  • Adjustable open tangent iron sights - Great field of view
  • Textured pistol grip - Appropriate for modern AK variants
  • Russian AK dovetail side mount - Compatible with Russian AK optics or 20mm adapters
  • Steel top cover, magazine release/trigger guard assembly and cleaning rod
  • High density polymer receiver, front sight and gas tube
  • Realistic disassembly - VFC style, all pins and rivets, no screws!
  • Front and rear sling points - Ideal for AK47/74 replica slings, suitable for most two-point slings
  • Storage compartment in the stock - Ideal for tactical sweeties
  • Compatible with AK47/74 AEG magazines - 5.45 Style to please the stitch counters, but most will work

Package Includes

  • Specna Arms SA-J73 AK-105 CORE™ Carbine AEG
  • 450rnd High capacity S-MAG magazine
  • User manual

Specification

General

Weapon Construction External
Weapon Type
Assault Rifle
Over 18 Only Icon
Over 18
Yes
Icon UKARA - United Kingdom Airsoft Retailer Association
Defence / UKARA Required
Yes, No,
FPS Icon
FPS (Feet Per Second), using 0.20g BB
Approx. 305fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Yes
Screwdriver Icon
Pre-Built
Yes
Package
Included Items
Magazine
Skill Level Icon
User Skill Level
Starter

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 2.42kg
Weapon Length Collapsed
Length (Collapsed)
60cm
Weapon Length Extended
Length (Extended)
83cm

Construction

Colour Wheel Greyscale
Primary Colour
Black
Construction Icon
Construction
Steel top cover, fire selector, trigger guard assembly and trim parts. Alloy gas tube, trunnion block, outer barrel, muzzle device. Polymer stock, pistol grip, handguards, gas tube and gas block.
Weapon Construction External
External Construction
Polymer
Alloy
Steel
Gearbox Icon
Internal Construction
Polymer
Alloy
Aluminium
Steel

Weapon Specific

Power Source Icon
Powered By
Electric
Blowback Icon
Blowback
None
Weapon Platform
AK, AK74, AK Variant , Assault Rifle, AK-105,
Magazine Style Icon
Magazine Style
AK Platform, Long Gun Magazine, Assault Rifle,
Fire Select Icon
Fire Selector
PatrolBase | Fire Select Safe
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
Standard
Weapon Scale Icon
Weapon Scale
1:1
Suggested BB Weight
0.25g

Hop-Up

Hop-Up Unit Icon
Hop-Up Unit
Yes
Hop-Up Unit Adjuster Icon
Hop-Up Adjuster
Slider
Hop-Up Unit Location Icon
Hop-Up Location
Behind mock bolt carrier, accessible when the charging handle is pulled and held to the rear.

Furniture

Weapon Furniture Icon
Furniture
  • Ambidextrous Magazine Release
  • Textured Pistol Grip
  • sling points front and rear
  • Adjustable open iron sights
  • Russian AK style side rail mount
  • AK105 gas booster flash hider
  • Side folding stock
Rail System Icon
Rail System
AK Dovetail Rail
Icon Stock Positions
Stock Setting
Folding
Weapon Length Extended
Stock Positions
2 Position
Sight Type Icon
Sight Type
Iron Sights , Tangent Open Iron Sight, Open Iron Sight,
Sling Plate Icon
Sling Options
Stock , Handguard , Loop ,

Barrel

Outer Barrel Length (in)
12''
Icon Thread Type
Outer Barrel Thread Type
Male
Icon Thread Direction
Outer Barrel Thread Direction
CCW (Counter Clockwise)
Outer Barrel Thread Size
14mm
Inner Barrel Diameter
6.03mm
Inner Barrel Length
300mm

Magazine Specific

Magazine Type
High Capacity, Wheel Wound, AEG,
Magazine BB Capacity
Approx. 450 Rounds
Magazine BB Fill Method
Fill Window
Magazine BB Fill Location
Top

Electric Gun Specific Information

Gearbox
Gearbox Icon
Gearbox Version
V3 Gearbox
Wiring Icon
Gearbox Wiring
Top Wired
Spring Change Icon
Gearbox Quick Change Spring
Yes
Digital Trigger Icon
Gearbox Electronic Trigger
No
Split Gearbox Icon
Split Gearbox Design
No
Motor
Airsoft Motor Icon
Motor Type
Standard
Battery Specific
Battery Connector
Patrol Base | Icon | Mini Tamiya
Mini Tamiya
Compatible Battery
Compatible Battery Type
Li-Po
Compatible Battery Configuration
Stick
Compatible Battery Voltage
7.4v

Product Testing Data

Notepad Icon
Test Description
305 FPS +/- 10%
Notepad Icon
Tested Using
0.2g ASG BLASTER
Notepad Icon
Test Date
21/12/2022

Size guide

Joule Charts

Special Instructions

These table can be used as a reference to see if the BB weight you are using will be over acceptable Joulage limits at some Airsoft Sites in the UK. To check if the weight can be used chrono your weapon using the BB you intend to use, and then compare it to the chart.

FPS, Power and Joule Limits can vary from site to site, so please get in touch with where you're going to play with in advance to avoid disappointment.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, with a 350fps limit for Automatic Replicas, 400fps for Semi-Automatic Replicas, and 500fps for Bolt Action Replicas.

Tap the tabs below to open the relevant chart for your replica.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, and is the equivalent of 350fps, using 0.20g BB resulting in an upper limit of 1.14j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
325 0.98 1.23 1.37 1.47 1.57 1.77 1.96 2.11 2.21 2.45
328 1.00 1.25 1.40 1.50 1.60 1.80 2.00 2.15 2.25 2.50
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
335 1.04 1.30 1.46 1.56 1.67 1.88 2.09 2.24 2.35 2.61
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
345 1.11 1.38 1.55 1.66 1.77 1.99 2.21 2.38 2.49 2.76
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
355 1.17 1.46 1.64 1.76 1.87 2.11 2.34 2.52 2.63 2.93
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 400fps, using 0.20g BB resulting in an upper limit of 1.49j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 500fps, using 0.20g BB resulting in an upper limit of 2.32j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90
420 1.64 2.05 2.29 2.46 2.62 2.95 3.28 3.52 3.69 4.10
430 1.72 2.15 2.40 2.58 2.75 3.09 3.44 3.69 3.86 4.29
440 1.80 2.25 2.52 2.70 2.88 3.24 3.60 3.87 4.05 4.50
450 1.88 2.35 2.63 2.82 3.01 3.39 3.76 4.04 4.23 4.70
460 1.97 2.46 2.75 2.95 3.15 3.54 3.93 4.23 4.42 4.91
470 2.05 2.57 2.87 3.08 3.28 3.69 4.10 4.41 4.62 5.13
480 2.14 2.68 3.00 3.21 3.42 3.85 4.28 4.60 4.82 5.35
490 2.23 2.79 3.12 3.35 3.57 4.02 4.46 4.80 5.02 5.58
500 2.32 2.90 3.25 3.48 3.72 4.18 4.65 4.99 5.23 5.81
510 2.42 3.02 3.38 3.62 3.87 4.35 4.83 5.20 5.44 6.04