Time for some BCM AR15 action!

Published on August 5, 2016
Duration: 20:18

This guide details the assembly and zeroing of a custom BCM AR-15 build, emphasizing component compatibility and reliability. It covers the installation of specific parts like the KMR Alpha Rail, Trijicon MRO, and Griffin Armament suppressor. The process includes range testing with Freedom Munitions ammo and highlights the importance of QD mounts and reliable magazines, drawing on the expertise of Tim, owner of Copper Custom Armament.

Quick Summary

This guide details the assembly and testing of a custom BCM AR-15, featuring a 15" KMR Alpha Rail, Trijicon MRO optic, and Griffin Armament suppressor. It emphasizes component compatibility from manufacturers like BCM and highlights the reliability of Lancer L5 AWM magazines. Range testing with Freedom Munitions ammo confirmed suppressor performance and optic co-witness.

Chapters

  1. 00:23AR-15 Reliability and History
  2. 01:59Preference for BCM Builds
  3. 04:09Rifle Build Specifications
  4. 05:47Accessories and Optics
  5. 08:30Sling and Magazines
  6. 11:17Range Testing and Suppressor Use

Frequently Asked Questions

What are the key components of the custom BCM AR-15 build discussed?

The build features a BCM lower with an EGA engraving, a 15" BCM KMR Alpha Rail, a 16" pencil-weight barrel with a 1:7 twist, Griffin Armament Hammer Comp, InForce WML, Magpul Pro BUIS, Trijicon MRO on a Midwest Industries QD mount, Savvy Sniper sling, and Lancer L5 AWM magazines.

Why is a QD mount preferred for the Trijicon MRO optic?

A Quick Detach (QD) mount allows the user to rapidly remove the Trijicon MRO optic if it becomes obscured by dirt, debris, or damage, ensuring the rifle remains usable with backup iron sights if necessary.

What ammunition was used for range testing, and what was tested?

Freedom Munitions 55gr ammunition was used for sighting in at 50 and 100 yards. The Griffin Armament M4SDII suppressor was tested for zero shift and co-witness with iron sights through the suppressed setup.

What advice is given regarding AR-15 magazines?

The speaker advises switching to magazines like the Lancer L5 AWM, which feature steel-reinforced feed lips. This is recommended over older polymer magazines that can develop issues when stored loaded for extended periods.

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