EKO Custom M4A1 RIS, 140m/s, AirsoftGuns, BY-051, BI-5181M

Professionally upgraded version EKO Custom electric airsoft guns M4A1 RIS [BY-051/BI-5181M] with muzzle velocity up to 140 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.

As the name suggests, it is a more economical version of the popular weapon Custom. It offers similar performance at a better price. In this variant rebarreled original motor and steel gears with the basic gear ratio. Furthermore, leaving the original placed brass cylinder and the base Spring guides with the bearing spring. Despite EKO version includes a large number of high-quality parts that are not in this price range can withstand routine and other related upgrades.

The metal gun comes from the latest edition of which has recently processed metal body with functional dust cover. Modern type M4 with metal RIS handguard, tactical retractable stock (6 setting positions) and a removable transport handle, it is possible to attach different scopes and red dots on the sight rail.

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

Ventilation from the SHS:
CNC metal piston head with the bearing
SHS metal cylinder head M4
Aluminum nozzle M16/M4 - 21.5 mm

Stress parts from SHS:
Precise piston with steel teeth

Power modules from SHS:
Spring M130

And the other:
Metal Hop-Up set M16/M4
Gilded T-Dean connector
Universal MOS FET switching set - type 3D

Initial metal reinforced gearbox was modified and metal chamber of gun was arching 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 M130 and Thanks to quality cylinder set and good coaxiality performance up to 140 m/s is achieved. The weapon is luxuriously equipped with low resistance wiring and silicon MOS FET switch which is absolutely necessarywith strong springs, 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 with tactical sling, sling sviwel, cleaning rod, Wind Up Hi-cap Magazine 300rds, tactical grip, 2pc covers on RIS rails and box AN/PEQ 2 (imitation laser sight is used to place battery).