Brownells Retro Colt 4X Optic

Published on February 19, 2020
Duration: 8:37

This guide details the installation and initial zeroing of the Brownells Retro 4x20 Optic, a reproduction of the original Colt optic. It covers mounting the optic and adjusting its Bullet Drop Compensator (BDC) using a spent casing, emphasizing historical accuracy for retro builds. The information is presented with the authority of firearms instructor Eric from Iraqveteran8888.

Quick Summary

The Brownells Retro 4x20 Optic is a faithful reproduction of the original Colt 4x optic, manufactured in Japan. It offers 4x magnification, a 20mm objective lens, and features a Bullet Drop Compensator (BDC) calibrated for 55-grain .223 Rem ammunition up to 500 yards. Adjustments are made using a spent casing, ideal for retro AR-15 builds.

Chapters

  1. 00:00Introduction and Shooting Demo
  2. 01:11Brownells Retro 4x20 Optic Overview
  3. 02:08Technical Adjustments and BDC
  4. 02:56Range Testing (100-250 Yards)
  5. 04:56Ammunition and Magazines
  6. 06:06Final Thoughts and Accuracy

Frequently Asked Questions

What is the Brownells Retro 4x20 Optic?

The Brownells Retro 4x20 Optic is a reproduction of the original Colt 4x optic, manufactured in Japan to maintain historical accuracy. It features a 4x magnification and a 20mm objective lens, designed for retro AR-15 builds.

How is the Brownells Retro 4x20 Optic adjusted?

Adjustments for the Brownells Retro 4x20 Optic can be made using a spent .223 casing instead of a traditional screwdriver. The turrets are marked for range adjustments.

What ammunition is the BDC on the Retro 4x20 Optic calibrated for?

The Bullet Drop Compensator (BDC) on the Brownells Retro 4x20 Optic is calibrated for 55-grain projectiles, with adjustments available for distances up to 500 yards.

What rifle is shown with the Brownells Retro 4x20 Optic?

The video showcases the Brownells Retro 4x20 Optic mounted on a retro-style AR-15, specifically the Brownells BRN-601. It also features Brownells waffle pattern magazines.

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