BI-3981M assault riflereplica

  • Muzzle velocity: 350 FPS
  • Length : 715 / 795 mm
  • Weight: 3500 g

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BI-3981M assault riflereplica
Manufacturer: BOYI/DBOYS
Product code: DBY-01-000127
Rating4/54.00 / 5 (6 reviews)
Out of stock.
Ready to ship in days
Cost from 2,42 €
155,37 €
155.37 / 1pcs
Out Of Stock

    BI-3981M assault rifle replica


The BI-3981M replica is made of metal and plastic. The SF type stock, the pistol grip and the RIS rail cover panel are made of plastic. On the other hand, the elements such as the replica’s body, the outer barrel and the gas-pipe replica, the RIS rail system, the adjustable cocking handle, the hop-up chamber, the tactical sling attachment point, the magazine, the stock’s pipe are made of metal. The carbine is also equipped with an adjustable hop-up system to which we gain access by pulling back the cocking handle and which opens the dust covers under which the adjustment knob is situated.



    The set includes:

     - a replica,
     - a magazine,
     - a battery,
     - a charger,
     - a tactical grip,
     - a one point tactical sling,



Tech specs:
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

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.

v2 Gearbox
Type of fire:
Single, auto
Made of:
Metal + plastic
Lenght [mm]:

The length of the replca is measured between the two most distant points of each other. Different models have several of these values, because of its design allows to increase or decrease it length (eg.  folding stock or extended flash hider).

715 / 795
Inner barrel length [mm]:
Weight [g]:

This is a value that includes the weight of the replica, magazine and other accessories that are include in set without a battery, charger, cleaning rod, etc., etc.

Battery Voltage [V]:
Battery Capacity [mAh]:

Battery capacity determines the time, which it accumulated enough energy to work gearbox. The greater  capacity, then replica will shoot longer.

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.

Users reviews
Number of reviews: 6 Average rating: 4.00
Rate: Rate: 5
When will this weapon be available?
Rate: Rate: 5
Realy nice m4
Rate: Rate: 4
Well then, itself I really like the gun. But it is realistic to paint the reality of it so a couple of things to remember about him. First, as the biggest problem, though not serious, that RIS little cluke. The RIS upper part can be fixed with the screw fore the first sighting. The under of the RIS still clucke. This metal plate on the inside edge of the fold of RIS can be drawn closer and then it no longer cluckes. The gear box bearings are replaced with better quality. I have buy a weak spring, which around 380 FPS shoot because the original spring produces around 410 FPS, which does not comply with the rules of the game in Hungary. The factory magasin little clucke. The rifle is full metal , except for the grip and stock, but they are made of high-quality sophisticated and beautiful plastic. The dispersion I have not looked, but not great based on current shots. So it's not perfect, but the price-performance ratio is very good, especially devaluation.
Rate: Rate: 4
Nice gun for this price! although it shoots 400+fps with 0.2 bb's keep that in mind because i have to change to spring to get under 360 fps.
Rate: Rate: 1
Bought this with a lot on anticipation, and expected it to preform just as an airsoft gun should. However, after it arrived and I opened the package, I have found it to be money well wasted. The gun's upper receiver does not even line up properly with the lower receiver meaning that there is a big gap between the receivers. Also, the sound when firing the gun is absolutely horrible, like a "twang" sound. Disappointingly, the guns accuracy is terrible as bb's fly all over the place even when the hop up has been adjusted. All in all, this gun has been a major disappointment, and I expect that will get back to me about my problems with this product as I have spent a lot of time and money on buying from them. Please make a valued customer feel more welcome again as I am not impressed.
Rate: Rate: 5
BI-3981M assault riflereplica
got this one also and its very good..metal body..good range and the rate of fire is very good..5 stars..lito-tyrrelstown dublin 15
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