The Alpha Parts Stainless Steel Anti-Rotation CNC Hop Up Set is a CNC stainless steel constructed anti-rotation hop up unit designed for the Systema PTW AR15/M4 AEG. This is a drop-in fit, and is designed to be a upgrade version of the stock hop up unit.

Compatibility:

• Systema PTW M4/AR15 Electric Airsoft Rifle

Includes:

• x1 Alpha Parts Stainless Steel Anti-Rotation CNC Hop Up Set for Systema PTW M4 Series