BCM MK2 Upper Receiver

Published on December 13, 2019
Duration: 5:25

This entry details the BCM MK2 Upper Receiver, as presented by Larry Vickers and Paul Buffoni. It highlights the redesign's focus on increased structural integrity around the ejection port, improved gas management for suppressed use, and enhanced performance benefits like better accuracy and bolt life. The MK2 utilizes 7075-T6 aluminum for a robust yet comparable weight to standard USGI uppers.

Quick Summary

The BCM MK2 Upper Receiver enhances AR-15 platforms with 60% more mass around the ejection port for improved rigidity, accuracy, and bolt life. It features relocated forward controls and internal gas management for better suppressed shooting performance, all while using 7075-T6 aluminum at a comparable weight to standard USGI uppers.

Chapters

  1. 00:00Introduction and Shooting Demo
  2. 00:44Design Philosophy: 21st Century M4
  3. 01:16Forward Assist & Brass Deflector Redesign
  4. 02:04Structural Comparison (Mass & Material)
  5. 03:00Performance Benefits (Accuracy, Bolt Life)
  6. 03:48Gas Management for Suppressed Use
  7. 04:24Availability and Pricing

Frequently Asked Questions

What are the main advantages of the BCM MK2 Upper Receiver?

The BCM MK2 Upper Receiver offers significantly increased structural integrity around the ejection port (60% more mass), improved gas management for suppressed shooting, enhanced accuracy, and increased bolt life compared to standard USGI uppers.

How does the BCM MK2 Upper Receiver improve suppressed shooting?

It features an internal gas expansion chamber and exhaust ports located near the charging handle, designed to bleed off excess gas pressure, reducing bolt carrier speed and improving the shooting experience when using a suppressor.

What materials and weight does the BCM MK2 Upper Receiver use?

The MK2 upper is forged from 7075-T6 aluminum, maintaining a weight of approximately 7.75 oz, which is comparable to standard USGI uppers despite its enhanced structural features.

What is the purpose of the relocated forward assist and brass deflector on the MK2?

The forward assist and brass deflector are moved forward on the MK2 upper to add mass around the ejection port for structural reinforcement and to clear space, allowing for the use of ambidextrous charging handles and sling mounts.

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