Durable Custom M4 CQB-R, 130m, s AirsoftGuns, BY-039, BI-3981M

Durable Custom professionally upgraded version of the electric airsoft gun M4 CQB-R [BY-039/BI-3981M] 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 gun is supplied from the latest edition of which has recently processed metal body with functional dust cover. This is a shortened model M4 with metal RIS handguard, tactical retractable Crane stock (6 setting positions) and a removable rear sights on which it is possible to attach different scopes and red dots.

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 steel teeths
A set of classic gears - standard (16:1)
Rotary spring guide for the gearbox v. 2

Power modules from 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 switch kit - Type Standard

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 MOSFET switch, which is in strong springs absolutely necessary, but often it is underrated by manufactures and sellers. The package does not include charger or battery, we recommend to order types. See recommended accessories tab. The pack is supplied tactical sling, cleaning rod, Wind Up Hi-cap Magazine 300rds, tactical grip, 2pc covers on RIS rails and attachment to extend outside the barrel.