Fit for M4 Series Airsoft.
Install any red dot or scope onto this 20mm scope mount base.
One of the aluminum railed handguard, 2pcs rail cover.
2 Handguard constructed of Aluminum with 4 RIS rails totaly. 
Allow attachment of Scopes, Flashlights & Laser Sights,  Foregrip.
Replaces the standard front handguard of the M4 Series.
Hole Design offers increased heat dissipation for both of them.

Color: Black
Material: Aluminum
Upper Handguard length:  210mm
Lower Handguard length:  162mm
Weight with Box: 417g
Manufacturer : D-Boys