BCM MK2 Upper Receiver

Published on December 13, 2019
Duration: 5:25

This expert guide details the BCM MK2 Upper Receiver, a modern redesign of the M4 flat top. Larry Vickers and Paul Buffoni discuss its enhanced structural integrity, particularly around the ejection port, and improved gas management features for suppressed use. The MK2 offers increased rigidity for better accuracy and bolt life, while accommodating modern accessories.

Quick Summary

The BCM MK2 Upper Receiver enhances the M4 design with 60% more mass around the ejection port for improved rigidity, accuracy, and bolt life. It features relocated forward assist/brass deflector for accessory clearance and an internal gas expansion chamber for better suppressed shooting performance.

Chapters

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

Frequently Asked Questions

What are the key structural improvements of the BCM MK2 Upper Receiver over a standard USGI upper?

The BCM MK2 Upper Receiver significantly increases structural integrity by adding approximately 60% more mass around the ejection port. This enhanced rigidity contributes to better accuracy, increased bolt life, and improved safety during potential out-of-battery detonations.

How does the BCM MK2 Upper Receiver improve gas management, especially for suppressed shooting?

The MK2 features an internal expansion chamber and strategically placed exhaust ports near the charging handle. These elements work together to bleed off excess gas, reducing carrier speed and blowback, which is particularly beneficial when shooting with a suppressor attached.

What is the design philosophy behind the BCM MK2 Upper Receiver's forward assist and brass deflector?

The forward assist and brass deflector on the MK2 have been re-engineered and moved forward. This relocation not only adds mass to reinforce the ejection port area but also clears space, allowing for the use of ambidextrous charging handles and sling mounts without interference.

What material is the BCM MK2 Upper Receiver made from, and what is its approximate weight?

The BCM MK2 Upper Receiver is forged from 7075-T6 aluminum, a high-strength alloy commonly used in premium firearm components. It maintains a comparable weight to standard USGI uppers, approximately 7.75 ounces.

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