BI-3381M is well known replica made from Boyi. This Chinese producer as first made ``full metal`` type M4. Every part wish are metal In the Real steel, are also metal In Boyi!
(receiver,barrel,every small working elements-trigger, magazine latch, selector switch, dust cover, front assist knob, charging handle, sights, and sling attachments. )
To improve the skirmishing and working of the gun, we change parts during the full gun test. Those parts are included In to the price of the complete gun.

Parts inside:

1. - reinforced piston head
2. - 7mm steel bearing
3. - M125 spring
4. - spring guide with bearing for smoother spring work

Set Included:

1. - replica
2. - accumulator mini 8,4V /1200mAh
3. - charger
4. - magazine hi-cap 300rd
5. - Tactical sling
6. - Handle Grip

Every replica pass initial check up.
It`s being checked and overshooted on XCORTECH X3200 chronograph.

Due the purchase you can get new FIREFOX battery with 15% discount, please choose the battery and write „FIREFOX 15%” in the ordes` comment