Resources

The resources that we make available are Open Source and free of rights. Do not hesitate to contact us via our contact form or on our Discord server.

Apps

ZRO Ballistic Calculator

Designed with simplicity and efficiency in mind, our ballistic calculator offers a comprehensive solution to obtain accurate ballistic data for your rifles, all presented in either imperial or metric units, according to your preference.
This app uses 3 degrees of freedom (3 DOF) calculation.
All data are calculated and saved locally.

Web application
Download the Android APK

Handbooks

English handbooks:

• EN Handbook Rifle basics – AK – September 2025
• EN Handbook Rifle basics – AR15 – September 2025
• EN Handbook Pistol basics – September 2025
• EN Handbook Night vision – September 2025
• EN Handbook Mounted red dot pistol – February 2023
• EN Handbook Pistol low light – March 2023
• EN Handbook Firearm trainer – December 2023
• EN Handbook Rifle zero – April 2024

French handbooks:

• FR Booklet Instruction de base au pistolet – Septembre 2025
• FR Booklet Instruction de base AR15 – Septembre 2025
• FR Booklet Instruction de base AK – Septembre 2025
• FR Booklet Point rouge sur pistolet – Février 2023
• FR Booklet Pistolet par faible luminosité – Mars 2023

Target A4

• IPSC A-ZONE
• Performance target 0-25m
• Zeroing target MRAD 25m
• Zeroing target MRAD 100m
• Zeroing target MOA 25m
• Zeroing target MOA 100m

3D model

Dummy rounds for 3D print.

Rifle :

• 5.56×45
• 5.45×39
• 7.62×39
• 7.62×51

Pistol :

• .45 Auto
• 9×19