Magpul x Maztech - X4-FCS Quickstart

Published on June 17, 2025
Duration: 8:00

This guide details the installation and initial setup of the Magpul x Maztech X4-FCS rifle system. It covers battery charging and installation, compass calibration, LPVO mounting and leveling, digital reticle alignment with physical reticles, weapon and ammo profile creation, and the process of zeroing the system. The guide emphasizes accurate alignment and the use of ballistic solver features for improved aiming.

Quick Summary

To install the Magpul x Maztech X4-FCS, charge the 18650 batteries, install them in the unit, and calibrate the compass by moving the device up, down, and rotating it 360°. Then, mount your LPVO, align its physical reticle with the FCS's digital reticle, and save the settings.

Chapters

  1. 00:00Introduction & Unboxing
  2. 00:17Battery Charging & Installation
  3. 01:02Compass Calibration
  4. 01:41LPVO Installation & Alignment
  5. 03:48Mounting FCS to Firearm
  6. 05:13Weapon & Ammo Profile Setup
  7. 06:31Final Alignment & Zeroing
  8. 06:57Reticle & Ranging Functions
  9. 07:48Conclusion & Resources

Frequently Asked Questions

How do I install the batteries in the Magpul x Maztech X4-FCS?

First, fully charge the included 18650 batteries. Then, unscrew the battery compartment caps at the rear of the FCS unit. Insert the batteries according to the indicated orientation on the unit's side, and select the correct battery option on the screen.

What are the steps for calibrating the compass on the X4-FCS?

To calibrate the compass, turn the system straight up for approximately two seconds, then straight down for two seconds. Next, orient the system level with the ground and rotate it in a full 360° circle. Calibration is complete when a compass heading in degrees is displayed.

How do I align the digital reticle with the physical reticle on the X4-FCS?

Access the 'Display' menu, select 'Alignment,' and use the scroll wheel to align the digital crosshair with your physical reticle. Rotate the scope in its rings to level the physical reticle. Save the settings by holding the menu button.

What is the recommended torque for mounting the X4-FCS to a firearm?

The rail bolts on the X4-FCS should be tightened to a maximum of 77 inch-lbs using a half-inch wrench. If a torque wrench is unavailable, tighten the bolts one quarter of a turn past handtight.

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