KRYTAC Trident M4 / LMG Rotary Hop Up Unit
As many round fired from the pistol, the Hop Up Chamber Set will get old
This Parts is Design for Replace the Original Hop up Chamber Set
Also, fit tightly to the barrel base to keep the chamber being centered
Includes all parts needed for installation
Require expert on installing into stock AEG

As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed