Attaching Angle Degree Indicators or Cosine Degree Indicators to your firearm is easy, but calibrating them to read correctly is more challenging.
Attach the Flatline Ops TRUE BORE™ ADI/ACI Set-Up Tool™ to the tip of your barrel for quick and easy calibrating of your Indicators. Leveling the barrel becomes as easy as centering the bubble between the lines. Fits all barrels, any size.
Speed and ease is what you get with this ultra-lightweight, space-age polymer level.