Durable Custom M4A1, 130m/s, AirsoftGuns, BY-036, BI-3681M

Durable Custom professionally upgraded version of the electric airsoft gun M4A1 [BY-036/BI-3681M] with muzzle velocity up to 130 m/s. This is not a standard serial production in China or Taiwan, where it is not possible for weapons to be provided much time and care. Upgrade was provided by our company, which has more than ten years of experience and plenty of satisfied customers.

Identification Durable Custom suggests that the weapon was drawn particularly on high emphasis of solidity and durability of the internal parts of the gun. Configuration requirements for a good performance, healthy rate of fire, excellent durability and reliability. This full metal weapon comes from the latest edition of which has recently processed metal body with functional dust cover. This is the basic model M4 with plastic handguard, tactical retractable stock (6 setting positions) and a removable transport handle, on which it is possible to attach different scopes and red dots onto the sight.

Gun was fitted with favourite parts available from SHS, which has become a world leader in AEG upgrade. The following components were used..

Complete cylinder set from the SHS:
CNC metal piston head with the bearing
SHS metal cylinder head M4
Polished stainless steel cylinder M4
Aluminum nozzle M16/M4 - 21.5 mm

Stress parts from SHS:
Precise piston with a steel teeth
A set of classic gears - standard (16:1)
Rotary Spring guide for the gearbox v. 2

Performance parts from the SHS:
Long motor SHS - Torque
Spring M110
Precision 6.03 mm barrel

And the other:
Silicone Hop-Up rubber system
Delayer clip SHS
Metal Hop-Up set M16/M4
Gilded T-Dean connector
Universal MOS FET switching set - type 3D

Basic metal reinforced gearbox was modified and metal chamber of gun was propped by rubber o-rings, which is intended to prevent premature rupture of the gearbox. This problem is frequent for homemade upgrade and upgraded weapons mass-produced in China or Taiwan and with strong spring. The weapon is equipped with a spring M110 and inflict cylinder set and good alignment is achieved performance up to 130 m/s. The weapon is luxuriously equipped with low resistance wiring and silicon MOS FET switch which is absolutely necessary with strong springs absolutely necessary, but often manufacturers and retailers underestimate. The package does not include charger or battery, we recommend to order types. See recommended accessories tab. The pack is supplied with tactical sling, sling sviwel, cleaning rod and a Wind Up Hi-cap Magazine 300 BBs.