BCM MCMR (MLOK) Upper receiver AR-15

Published on December 12, 2017
Duration: 18:47

This video provides an in-depth look at the BCM MCMR (M-LOK) upper receiver for the AR-15 platform. Garand Thumb, a recognized subject matter expert, details its lightweight design, enhanced barrel profile, and mid-length gas system, highlighting its performance and value. The review also covers potential drawbacks like heat dissipation and durability under extreme stress, offering a balanced perspective for builders and enthusiasts.

Quick Summary

The BCM MCMR AR-15 upper receiver is lauded for its lightweight M-LOK rail (approx. 10.5 oz) and thin profile, enhancing weapon control. It features an enhanced barrel profile and mid-length gas system for improved accuracy (sub-MOA with match ammo) and reliability. While offering great value around $700-$900, potential drawbacks include reduced durability under extreme stress and faster heat buildup during rapid fire.

Chapters

  1. 00:00Introduction and Shooting Demo
  2. 02:55Basic Specifications and BCM Reputation
  3. 04:08BCM Quality and Pricing
  4. 04:52MCMR Rail System Features
  5. 06:03Enhanced Lightweight Barrel Profile
  6. 08:16Gas System and Port Sizing
  7. 10:11BCM Gunfighter Compensator
  8. 11:53Cons: Durability and Heat
  9. 14:18Personal Rifle Setup

Frequently Asked Questions

What are the key features of the BCM MCMR upper receiver?

The BCM MCMR upper receiver features a lightweight M-LOK handguard (approx. 10.5 oz) with a thin profile for improved weapon control. It utilizes an enhanced lightweight barrel profile and a mid-length gas system, often paired with a BCM Gunfighter compensator for reduced muzzle rise.

What is the typical price range for the BCM MCMR upper receiver?

The BCM MCMR upper receiver typically ranges from $670 to $700 without a bolt carrier group (BCG) and charging handle. Including these components, the price can reach around $900, positioning it as a high-value option in the premium market.

What are the potential drawbacks of the BCM MCMR rail system?

The primary drawbacks of the MCMR rail system are its potential for reduced durability under extreme stress compared to heavier rails, and its tendency to dissipate heat less effectively, causing it to heat up quickly during rapid fire.

What kind of accuracy can be expected from the BCM MCMR 14.5" upper?

With its enhanced lightweight barrel profile and mid-length gas system, the BCM MCMR 14.5" upper receiver is capable of approximately 2 MOA accuracy with standard ammunition and can achieve sub-MOA accuracy with match-grade ammunition.

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