-Top Dead Centre (TDC) Hop Up Adjustment System for VFC / GHK AR15 / M4 GBB Rifle Platforms

-Improved Accuracy and Shooting Stability

-Improved Inner Barrel Fixing Pin, Compatible with Marui, PDI, Unicorn Inner Barrels

-Allows Installation of Marui Pistol Spec. Hop Up Buckings

-Improved Airtight Hop-up Bucking Structure for Reliable Shot Consistency

-TDC Design Structure provides Straighter, Longer and more Stable Shot Stability

-Compatible with Stock Single Contact or Large Contact Hop-up Buckings

-CNC Aluminum Construct