100 Concepts Sizing Guide

Sizing Guide

How to Measure Your Optic:

To ensure the perfect fit for your accessories:

1. Use calipers or a precise ruler.

2. Measure the Outside Diameter (OD) edge to edge across the objective (front) or ocular (rear) end of your scope. This means the outside edge of the housing, not just the lens itself. 

3. For best results, measure in millimeters (mm).

Example:
If your optic measures 49.6mm, order the 50mm ScopeCap Pro.

TIP: If you're between sizes, round up to the next number for the best fit.

ScopeCap Pro (objective)

• Listed by millimeter diameter

• Use your measured OD to select the correct size

• It is best to round up if you're between sizes

HexCaps (for Red Dots)

• Each HexCap is designed for the specific red dot model listed

• Exception: Macro and Micro HexCaps — the optics that these two HexCaps fit are under the "specifications" tab on their respective pages.

LightCap & Rear ScopeCap Sizes

Use this table to find the correct size based on your optic or flashlight's OD:

Note: If your SureFire light is a DFT model (such as the Scout DFT), you will need the AWLS / Rein 3.0 / Turbo-specific LightCap, rather than one based solely on diameter.

ShockCollar Compatibility

ShockCollars match the size of the corresponding LightCap or ScopeCap. 

Example:

• If you use a Medium LightCap, you’ll also need a Medium ShockCollar

• If you use a Size 1 Universal ScopeCap, you’ll also need a Size 1 ShockCollar