SRS A2 Long Handguard Kraken S1 arm Tokyo marui use the ZET-System

Tokyo marui use the ZET-System that increases durability of the bolt and internal systems

● Adjustable Rear Sights : The drum rear sight is adjustable in height by turning the drum to select the different sight apertures and in height using a plus driver

although a little weaker

Interchangeable microphone

GBB (Check Slots on Photo if you're GBB Rifle is compatible with this barrel)

SRS A2 Long Handguard Kraken S1 arm Tokyo marui use the ZET-SystemSRS A2 long Handguard, Mlok CNC aviation grade aluminium 230 Grams For Silverback SRS A2 only (Not compatible with SRS A1) Desert Tech licenced product. Ref: SBA HDG 05 2. 11. 0. 0