Rifle Scope Angle Cosine Indicator with Bubble Level – Fits 1" & 30mm Tubes (Left / Right)

Shoot Uphill or Downhill — And Hit Your Target Every Time

When you're shooting at steep angles, standard holdover charts fail you. This Angle Cosine Indicator (ACI) mounts directly to your scope ring and gives you a real-time percentage readout — so you can instantly calculate the true horizontal distance to your target and compensate for gravity with precision. Whether you're hunting in the mountains or shooting long-range on a slope, this tool takes the guesswork out of angled shots.

Key Features

• Red Needle Angle Indicator: Moves in real time with your rifle and displays the cosine percentage of your angle — multiply by target distance to get the adjusted shooting distance
• Flip-Out Bubble Level: Secondary bubble level flips to the side for an additional leveling reference, helping eliminate cant and improve shot consistency
• Dual Tube Compatibility: Fits both 1-inch (25.4mm) and 30mm scope tubes — works with most standard rifle scopes
• Left or Right Mount: Available in left-hand and right-hand configurations to suit your shooting style and scope setup
• Lightweight Aluminum Construction: Solid aluminum alloy build keeps weight minimal without sacrificing durability
• Easy Installation: Attaches directly to your scope ring — no tools or modifications required

How to Use

1. Mount the ACI to your scope ring (left or right side)
2. Read the percentage displayed by the red needle at your shooting angle
3. Multiply the percentage by your target distance to get the adjusted horizontal distance
4. Apply your standard holdover for that adjusted distance

Specifications

Stop guessing on angled shots. Mount the ACI, read the needle, and hit your mark — every time.