Dynamic Precision Slide Compensator for Marui/ WE/ Umarex (VFC) Model 17 / 18C (Type B) Inner-Barrel-Length-(mm)_160mm In the middle there is

In the middle there is a switch that can select 4 different ways your AEG will fire:

Precision CNC Machined T-6061 Aircraft Grade Aluminum

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Polymer Receiver Grip

Standard barrel nuts can have problems when fitting with a Daniel Defense rail system

Dynamic Precision Slide Compensator for Marui/ WE/ Umarex (VFC) Model 17 / 18C (Type B) Inner-Barrel-Length-(mm)_160mm In the middle there isDynamic Precision Slide Compensator for Marui WE Umarex (VFC) Model 17 18C (Type B) Metal Construction Iincludes a guide rod for optimum fit Suitable for Tokyo Marui WE Umarex (VFC) Model 17 18C Series Airsoft Gins Gas Blow Back GBB Pistol