BI-3581M assault rifle replica

  • BI-3581M
  • The replica was made mostly of metal elements.
  • Muzzle velocity: 350 FPS

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BI-3581M assault rifle replica
Manufacturer: BOYI/DBOYS
Product code: DBY-01-000135
Rating4/54.43 / 5 (7 reviews)
Very small quantity of stock
Ready to ship in 1days
Cost from €1,60
134.47 / 1pcs
You save 23% (€40,16).
In stock
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      BI-3581M assault rifle replica
The replica was made of metal and ABS. The replica's body, the outer barrel, the RIS rails, the gas pipe dummy, the carrying handle, the cocking handle, the magazine or the stock's pipe were the metal profiled elements. The stock, the pistol grip, the Hop-Up chamber and the AN/PEQ2 dummy which holds the battery were made of plastic.
The carbine is equipped with an adjustable HopUp system which significantly improves the replica's efficiency. We gain access to it by pulling the cocking handle which opens the dust covers hiding the adjustment knob. In this model's meatl made gearbox, we can find 7mm ball bearings. It is possible to attach any kind of red dot scope or a scope which meets the RIS standard. The replica is equipped with a multi-position stock which's length can be adapted to the individual preferences and built of the shooter.


The set includes:

  • the BI-3581M replica,
  • a metal hi-cap type magazine,
  • a charger,
  • a mini type 8,4V 1100 mAh battery,
  • a three-point 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).

780 / 860
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.

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: 7 Average rating: 4.43
Rate: Rate: 5
Same for me as Rene, Alblasserdam. The weapon looks great and the price is very sharp. However the replica has a FPS 380+ out of the box. The weapon has been picked up by GLS and will be downgraded by Gunfire. Can't wait to get it back!
Rate: Rate: 3
Nice weighty rifle, but with a few things to watch out for: The paint seems to scratch quite easily, the stock is a bit wobbly and the vertical grip is pretty darn bad as it wont grab on well enough on the rail. My main problem is, though, that the battery must be fitted in the supplied AN/PEQ2 laser target pointer dummy and does not fit anywhere else. The rifle itself is pretty good, and for this price it is reasonable value, especially considering a 3 point sling and (bad) vertical grip come with the gun.
Rate: Rate: 5
Good body build quality, paint scratches to easily as in all D-Boys rifles in my opinion. The hanguard feels great and doesnt wable a bit! Anyway, It ain't a good idea to apply to much strenght on it as the metal bends with ease. Just tighten up those screws with a bit red loctite and you should be very well served.
Rate: Rate: 5
Cheap but good quality replica. One thing, You gonna need better hop-up. Recommed this
Rate: Rate: 5
Very good gun shoot around 350 FPS out of the box with me. Nice built quality.
Rate: Rate: 5
is a ok gun for the price. i am not a m4 fan but is ok and solid gun so overall i wil recommer this to beginne :)
Rate: Rate: 3
Looks very good and solid replica, only minor detail : mine was ~380 out of the box. gunfire made a pick up by gls and now i'm waiting for it to be downgraded, very good service. Cant wait to use this one :-)
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