ARX-100 Accuracy Tests

Published on August 20, 2014
Duration: 24:15

This guide details the process of installing a roll pin to reinforce the monolithic rail on a Beretta ARX-100, a common modification to address rail flex. The video features Tim, a recognized firearms expert, demonstrating the fix on a shooting range. The modification aims to improve accessory stability, though testing indicated it did not significantly alter the rifle's inherent accuracy, which was described as 'service grade' (under 3 MOA).

Quick Summary

The Beretta ARX-100's monolithic rail can flex due to its unsupported front and rear. A common fix involves installing a roll pin through the receiver into the rail, reinforcing it. While this addresses flex, the ARX-100 typically maintains 'service grade' accuracy (around 2-2.5 MOA), whereas custom bolt-actions like the Robar SR21 offer superior sub-MOA precision.

Chapters

  1. 00:10Robar SR21 Overview
  2. 01:52Gorilla Ammunition Performance
  3. 03:24Beretta ARX-100 Rail Issue
  4. 08:15Beretta ARX-100 Rail Fix
  5. 10:06ARX-100 Accuracy Testing
  6. 16:53MGI Hydra Demonstration
  7. 19:12Final Assessment

Frequently Asked Questions

What is the primary issue with the Beretta ARX-100's monolithic rail?

The Beretta ARX-100's monolithic rail can exhibit flex because its design, adapted from the military ARX-160, leaves the front and rear unsupported. This movement can be exacerbated when using heavy optics or applying torque during handling or shooting.

How is the monolithic rail flex on the Beretta ARX-100 typically fixed?

The common fix involves installing a roll pin through a pre-existing hole in the rear of the receiver and into the monolithic rail. This reinforcement shores up the rail, reducing or eliminating perceptible movement.

What kind of accuracy can be expected from the Beretta ARX-100 after the rail fix?

Even after the rail reinforcement modification, the Beretta ARX-100 typically achieves 'service grade' accuracy, generally falling between 2 to 2.5 MOA (Minute of Angle). This means groups of roughly 2 to 2.5 inches at 100 yards.

Which rifle demonstrated superior accuracy in the video?

The Robar SR21, a custom Remington 700 action housed in an MDT TAC 21 chassis and chambered in .308 Winchester, demonstrated significantly superior accuracy, achieving sub-MOA performance with groups as tight as 3/4 inch at 100 yards.

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