ERATAC Angle Cosine Indicator & ACI Holder with Level – Angle Cosine Indicator and Level Holder for Precise Long-Range Setups
In steep terrain and at long distances, angle and cant are real sources of error.
ERATAC Angle Cosine Indicator & ACI Holder with Level is an ERATAC holder or angle cosine indicator/level module for optic mounts and precise long-range setups.
An ACI or a level does not calculate or shoot for you. Angle information and rifle position must be correctly applied in ballistics, holdover, or turret adjustment. Variants and dimensions must match the existing rail, mount, or platform: Version: Mil Spec, Standard, Holder with Level.
Important note for classification:
An ACI or a level does not calculate or shoot for you. Angle information and rifle position must be correctly applied in ballistics, holdover, or turret adjustment.
Before purchasing, check: interface, mounting position, visibility in the shooting position, compatibility with the existing ERATAC/Picatinny base, tools, and actual intended use.
What makes this product technically special:
✔ Angle Control: helps with uphill or downhill shots where horizontal distance is critical.
✔ Level: makes cant visible and reduces lateral deviation due to a crooked rifle position.
✔ Mount-Adjacent System: sits close to the optic and remains easier to control in the shooting position.
✔ UNIVERSAL Interface Logic: fits compatible ERATAC mounts and accessory positions.
✔ Distance Benefit: particularly relevant for long-range, mountain hunting, and steep shooting angles.
Why this product?
This product solves a small but practically relevant interface problem. It is not a main system, but a component that makes mounting, operation, or control more reliable. The key is whether it is visible, accessible, and compatible with your actual setup.
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Error Prevention: reduces typical mounting or operating errors when used correctly.
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System Integration: complements existing ERATAC/Picatinny setups instead of replacing an entire platform.
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Reproducibility: helps to repeat settings and procedures more cleanly.
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Practical Benefit: useful for users who not only mount equipment but also use it in a controlled manner.
Instructor's Tip: Small parts cause big problems if used incorrectly
Before the first live use, check not only if the part fits, but if you can actually use it in the shooting position. A level that is not visible, or a control element that cannot be reached with gloves, provides no real advantage.
After mounting, always check function, free movement, and secure fit. Accessories on rails and mounts, in particular, can come loose due to recoil, transport, or frequent handling if they were only tightened by feel.
Our Assessment
The ERATAC Angle Cosine Indicator & ACI Holder with Level is useful if you want to solve exactly this interface problem and compatibility has been clarified in advance. It is less useful if you expect a small accessory part to compensate for fundamental mounting, shooting, or operating errors.
Suitable for:
- Range and precision setups with repeatable mounting work
- Hunting rifles with a deliberately designed optics/accessory logic
- Workbench, mounting, zeroing, and control shots
- Users who do not want to ignore small system errors
Less suitable for:
- Users without a suitable interface
- Setups where the component is not visible or accessible in the shooting position
- Users who do not perform mounting and control cleanly
- Cases where a different main system is actually needed
Direct Classification:
✔ ERATAC Angle Cosine Indicator & ACI Holder with Level: useful as a precise accessory for an existing setup.
✔ Improvised Solution: cheaper, but often less reproducible and more prone to errors.
The product is worthwhile if it solves a real problem: alignment, display, attachment, or operation. Without a suitable interface, it is the wrong part.
Application Scenarios
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Workbench / Mounting: clean alignment, checking, and retrofitting.
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Range: control of position, function, or accessory position under real recoil.
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Hunting: a useful addition if operation and visibility in the shooting position are suitable.
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Long Range: particularly relevant for angle, cant, and mounting errors.
Practical Tip: Do not infer compatibility from the name
ERATAC parts sometimes look similar but work with different interfaces. Check SKU, height, diameter, and interface – not just the product image or heading.
For accessories on optic mounts, also check whether turrets, parallax wheel, illumination unit, or magnification ring remain freely operable.
Features & Construction
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ACI/SWK: Angle Cosine Indicator for estimating the angle and effective horizontal distance.
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Level: visible control against canting in the shooting position.
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Mounting Position: must be positioned so that it remains readable in the shooting position.
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Practical Limit: the display does not replace ballistic data or clean shooting technique.
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Variant Logic: Version: Mil Spec, Standard, Holder with Level.
Technical Data
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Brand: ERATAC / Recknagel – Accessories for mounting, sighting, and weapon platforms.
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Product Type: ACI/Level Holder – Special component for defined interfaces.
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Variants: Version: Mil Spec, Standard, Holder with Level – selection must match the setup.
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Version: Mil Spec, Standard, Holder with Level – determines the suitable version, not just the appearance.
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Manufacturer/Item Numbers: Mil Spec: T0941-0001; Standard: T0941-0000; Holder with Level: T0940-0002.
Scope of Delivery
- 1x ERATAC Angle Cosine Indicator & ACI Holder with Level in the selected variant
Not included:
No weapon, no optics, no main mount, no torque wrench, and no other accessories. Only include additional parts if they are expressly part of the scope of delivery in the specific variant.
FAQ
Does the product fit every ERATAC mount?
No. ERATAC uses different interfaces and series. Check the item number, diameter, height, and interface of your mount.
Do I have to perform a function test after mounting?
Yes. Accessories and safety-relevant parts must be checked for secure fit, free movement, and function after mounting.
Is this product equally suitable for hunting and sport?
Only if the function matches the setup. For hunting, quick operation and minimal disturbance are important; for sport, reproducibility and precise control are often key.
Can the product compensate for mounting errors?
No. It can control or supplement, but it does not replace proper basic mounting, suitable height, or correct torques.
When is this product not useful?
If the interface does not fit or you cannot utilize the benefit in the shooting position. In that case, a different accessory or mount is a better choice.
Conclusion: The ERATAC Angle Cosine Indicator & ACI Holder with Level is a useful special part if the interface, function, and application truly match. It is not a universal remedy but a precise component for cleanly built setups.
