CNC bucking sleeve precisely centers the orientation of hop up bucks and keep it in place for lasting accuracy. The adjustment dial is easily access through the ejection port can be adjusted with any pointed tool without the need for disassembly, allowing efficient & streamlined hop-up tuning.

Spec:

• • GHK AR GBB system: Install without the included spacer.
  • VFC AR GBB system: Install with the included spacer.
  • Compatible with V3 VFCs only. Not compatible with L403A1