The Angle Cosine Indi­cator (ACI) is an indis­pens­able sniper tool for long distance precision shots when ai- ming up- or down­hill. The ACI helps you to easily calcu­late and correct the gravity‘s effect on your bullet‘s trajec­tory.

The bubble level enables the shooter to under­stand if the gun is completely level. Our ERATAC® mount with ACI and bubble level can be easily attached to our UNIVERSAL-inter­face. It is not neces­sary to alter the posi­tion of the scope. The posi­tion of the ACI is such that the red needle is visible even when using a scope with the illu­mi­na­tion control on the left side and while already aiming. The Mil-Spec. version is water­proof for 35 min. and 1 meter depth of water.

The posi­tion of the eleva­tion turret remains always visible because of the lateral bubble level.



ACI Mil-Spec.


Adapter with Bubble Level for Mounts
ø30 mm and ø34 mm (without ACI)


Adapter with Bubble Level for Mounts
ø36 mm (without ACI)