This is the EdGi Custom Works VSR10 Compatible Sniper TDC (Install video below)
This high-quality upgraded hop adjustment wheel allows you to adjust your hop on the fly, and works with both the Action Army and Stock Hop units.
Installation is easy and will require a 4mm drill bit and drill to make the hole.
***TEMPLATE FOR DRILL HOLE INCLUDED***
*This TDC is compatible with the Action Army Hop up
*This TDC is compatible with the VSR10 Stock Hop up