SA-B02 ONE™ carbine replica - black

  • Length: 700 - 780 mm
  • Weight: 2550 g
  • Color: black
  • Made of: an alloy of zinc and aluminum, steel and plastic
  • Muzzle velocity: ~410 / ~310 FPS
  • Enter & Convert™ quick main spring exchange system
  • Manufacturer: Specna Arms

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SA-B02 ONE™ carbine replica - black
Manufacturer: Specna Arms
Product code: SPE-01-004033
Rating5/54.86 / 5 (29 reviews)
Very large quantity of stock
Ready to ship in 3days
Cost from 3,09 €
195,30 €
195.30 / 1pcs
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Specna Arms SA-B02 carbine replica

The replica was fitted very well – in a way that it was previously observable only in the G&P or Classic Army class replicas. It was also perfectly balanced. This ensures a perfect maneuverability of the replica while as its weight is almost not felt when you place the replica on the shoulder.

The replica uses a quick main spring exchange system, the so-called Enter & Convert™. This allows for a quick and fluent adaptation of the replica’s power to the conditions of the battlefield without the need of having access to a workshop or a number of specialist tools – when you take the gearbox out the replica’s body, the process of exchanging the main spring takes literally seconds.

The advantages of the Enter & Convert™ system are hard to overestimate. In the light of the laws existing in Europe and which limit the muzzle velocity of the replica and the establishments inside the airsoft society, this system guaranties the user great possibilities and more liberty. The Enter & Convert™ system allows to change the main spring in little amount of time, and, what is followed by this, adapted the muzzle velocity of the replica to the battlefield so it guaranties a perfect compromise between effectiveness of firing and the safety of your own and other players.

The replica was fully adapted to cooperate with LiPo and LiFe type batteries. Thanks to the basic muzzle velocity of about 410 FPS which is guaranteed by the default main spring, the replica is perfect to be used in middle distances. The set also includes an M90 main spring which allows to decrease the muzzle velocity to about 310 FPS making the replica perfectly adapted for short range operations or fighting inside buildings.

The gearbox which is reinforced on the height of the cylinder’s head hides a steel main spring guide which is the element of the Enter & Convert™ system and also 8mm ball bearings and steel thread-wheels which are placed on spacers. The system is secured with the use of four anti-reversals. The light, polycarbonate piston is equipped with a steel tooth in order to increase its durability. There is a type 2 cylinder and the steel breaker and a metal hop-up chamber applied in this replica.

The Upgraded Version is equipped with some new, improved internal parts:

- set of reinforced steel gears
- steel spring guide
- lightweight, polymer piston
- aluminum, sealed piston head
- metal cylinder head
- air seal metal nozzle

The replica is equipped with a top 22mm RIS rail, a set of front 22mm RIS rails and an adjustable stock. The top RIS rail holds the flip-up type iron aiming sights which can be easily detached and replaced with any optical-electronic aiming devices. Thanks to the collapsible stock which is ended with a anti-skid stock’s foot, it is possible to adapt the replica’s length to the built and the preferences of the shooter. The default muzzle flash-hider is placed on a 14mm counter-clockwise thread what allows the attachment of a sound suppressor in its place.

In order to increase the realism level, the replica was equipped with a functional bolt catch lever.

The replica set also includes a steel hi-cap type magazine which holds 300 BB pellets.

Specna Arms replicas are compatible with most of the magazines available in the market, for instance with magazines of the following manufacturers:
 - BOYI,
 - Airsoft Systems,
 - SRC,
 - King Arms,
 - MAG, 
 - STAR,
 - ACM.

Additional accessories shown in photographs are not included in the kit!

The set does not include the battery nor charger.

The set includes:

- the replica,
- a magazine,
- the iron aiming sights,
- an additional main spring,



According to report number HKGEC1600157401

This product is compliant with EU RoHS (Restriction of Hazardous Substances) Directive 2011/65/EU annex II, replacing Directive 2002/95/EC, concerning limiting the amount of hazardous substances in toys and electronics.

Which means that the Specna Arms brand is free of the following hazardous materials:
- Lead
- Mercury
- Cadm
- Hexavalent chromium
- Polybrominated biphenyls
- Polybrominated diphenyl ether
- Bis(20ethylhexyl) phthalate
- Butyl benzyl phthalate
- Dibutyl phthalate
- Diisobutyl phthalate


Tech specs:
Specna Arms SA-B02
Specna Arms
12 months
Velocity [FPS]:

It is the spped of bb, while its leaving the innerbarrel of replica. This speed is measured in FPS (Feet Per Second).

1 FPS = 0,3 m/s

1 J = 99 m/s

1 J = 326,7 FPS

~400 / ~310
Propulsion / Powered by:
Gearbox version:

Indications v2, v3, v6 does not mean the level of advance, but only shape of gearbox skeleton which was used and selected by the manufacturer depending on the capabilities of the body of the replica. For example, a models of the M4/M16 family, MP5, have a v2 gearbox, while the AK family have gearbox v3.

Modified v2 Gearbox
Type of fire:
Single, auto
Made of:
Metal + plastic + steel
Length [mm]:
765 - 798
Inner barrel length [mm]:
Weight [g]:
Battery included:

NiCd rechargeable battery is characterized by high efficiency current-carrying capacity, but there are disruptive effect on memory. Should be unloaded and loaded in the full cycle, ie, it is recommended to fully discharge, and after unloading must charge the battery immediately without leaving it for a long time in a discharged state.
NiMH batteries have a higher self-discharge over time and shorten the life - on the other hand, they earn about 30% more capacity.

Magazine type:
Hi-Cap magazine
Magazine capacity [pcs]:

Hop-Up system is used for overclocking bb during the shot (putting it in rotation), through which, it extends its flight path. Acting laws of physics make that bb lift up, while the gravitational force take it down. Appropriate adjustment of Hop-Up, will compensate for these two factors, which result in long and straight flight for longer distance and be greater focus shot (to improve accuracy).

Yes, adjustable
Blow Back:

Blow back is a simulation system of the cocking lever - it imitates the work of it as the equivalent sharp. This system raises the realism and adds a lot more experience during shooting.

Quick Spring Change System:

SA-B02 ONE™ carbine replica - black - reviews

Number of reviews: 29 Average rating: 4.86
Rate: Rate: 5
Author: Michael, Whitehills
incredibly surprised by this gun. great price and shoots very good. very well made strong weapon. overall very impressed. great buy
Rate: Rate: 5
Author: Jayvee, Drogheda
Full metal build and easily upgradable. Very impressed with the gun but just like the other people said get a new hop up and barrel and youll have a fantastic gun.
Rate: Rate: 5
Author: Grigori, Tartu
Very good replica from specna
Rate: Rate: 4
Author: Kim, Fredericia
I have used this gun for couple of weeks now, and it has really surprised me. Considering the ptice of the gun, it is extremely well made and precise. It shoots roughly 426 fps out of the box and has endless possibilities when it comes to accessories. Without a doubt one of the best guns for beginners
Rate: Rate: 5
Author: Jonathan, Hellevoetsluis
Amazing ! Shoots really well. Accuracy is great in combination with single and auto. Best buy !
Rate: Rate: 5
Author: John, Orpington
never had a problem with specna replicas . great guns for great prices
Rate: Rate: 4
Author: Boyan, Sofia
The hop up bucking is rough and stiff, the nub is terrible, the cogwheels are lame plastic and a bit shifty (but they seem kind of to be doing the job). Overall the hop-up unit is bad. I changed the nub and the bucking + a precision barrel and I am very happy with the result [6.03 barrel and a MadBull Shark bucking + nub (red bucking)]. Everything else on the gun I like, except the buttstock, which is the cheapest stock possible, however it doesn't really bother me. I recommend the gun, if you have money for some extra adjustments (about 30 euro did it for me)
Rate: Rate: 5
Author: Alwin, Rockanje
I'm very possitive! Super Airsoft "gun" en gunfire is very fast with delivery. Package of the product is very nice done of Gunfire.
Rate: Rate: 5
Author: Attila, Budapest
I love it
Rate: Rate: 4
Author: David, Den Haag
Hop up turns itself off, screws are very sensetive to damage so must be very carfull otherwise you must drill them out. Other then that its great. 3.5/5
Rate: Rate: 5
Author: Róbert, Budapest
This gun is better than the others for this price. This gun have a full metal body instead of dboys.I truly recomend it.
Rate: Rate: 5
Author: Arnoldas, Panevezys
Two words: Love it!
Rate: Rate: 5
Author: Palomba, Lodelinsart
sturdy and very nice m4 cqb love it
Rate: Rate: 5
Author: Peter, Oosterhout (nb)
I can recommend this M4 to everyone: it's a full metal version for a great price with a very good finish. It took some time to figure out how to install the M90 spring, but after some searching on YouTube and with the right tools it's perfectly doable (though you really need to be handy with tools and mechanics to perform it yourself). All in all a great buy!
Rate: Rate: 5
Author: Ruben, Riel
Hi this is a great gun feels good and is not wobbly although the selector plate broke at first time opening the replica to exchange the spring The fire selector needs to be in semi before taking gb out. The rest of the gun is great
Rate: Rate: 5
Author: Sylvain, Villers-lès-Nancy
Nice job Gunfire ! This is really a nice gun and the look is just perfect :) . The gears need some grease ^^' and the barrel is a bit too large but... I am satisfied !
Rate: Rate: 5
Author: Henry, Beilen
I don't think you will find a better M4 replica in this price range with these features. Almost full metal, good internals. Shoots straight and far!
Rate: Rate: 4
Author: Gábor, Eger
SA B02 is made of hi quality metal which is a good point for the manufacturer. The quad rail is wobbling a bit, but it's OK. It has silicone wiring. I have one problem with this which is the "functional" bolt catch lever which is even not working therefore I am a bit dissatisfied. In conclusion it's a very good and strong replica but it has these annoying problems.
Rate: Rate: 5
Author: Damir, Trbovlje
I am very satisfied with this gun!
Rate: Rate: 5
Author: J.G., BALKBRUG
The Specna Arms SA-B02 is surprisingly good. It shoots 405 fps out of the box, so for Holland you need to reduce it to below 360 fps. The other spring is to weak, it shoots around 300 fps. Good quality, great looks. One Fun Gun!!!
Rate: Rate: 5
Author: Peter, Berkel-Enschot
Great price! Good gun Outside is very high quality metal but the internals could use some more metal. Even the nozzle is plastic without an o-ring.
Rate: Rate: 5
Author: Jevgeni, Tallinn
Exellent made gun for this price,highly recommend to buy it. But be prepare to change hop-up bucking,sometimes it doesnt work properly because of its design :)
Rate: Rate: 5
Author: Bruno Moreira, Figueiras - Lousada
good quality gun, shoots nicely, good feeding from the mags .... highly recommended
Rate: Rate: 5
Author: Nicolas, Voiron
Change the hop-up for a Guarder or Prom and you have a really good gun.
Rate: Rate: 5
Author: Joao, Aljustrel
Great quality/price ratio, Sturdy, balanced weapon. Heavier than I thought. The stock's cap its a bit loose, but other than that, nothing to report. An ideal weapon for someone to begin playing. Never heard of Specna Arms before purchasing this replica, now I'm a fan.
Rate: Rate: 5
Author: Volodymyr, Szigetszentmiklos
Hey! Any idea from what material body made of?
Rate: Rate: 5
had small problem with trigger, but its easy to fix. shoots perfect, looks cool. nice rof with 11.1v.
Rate: Rate: 5
The gun is very good, rear ironsight could be better made, hop up needs to be adjusted after every 50 shots, but its polible to mend it at home by tightening the screw. sounds good when fired. the jamming rod was missing, but thats no big deal as i have another one. in total gun is very good and price - deal of the year.
Rate: Rate: 5
Author: Thomas, TRELISSAC
great peace of kit full metal even the flash hider,i realy recomend it to any body pro or not
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