BCM 11.5'' AR-15 Upper Receiver With Front Sight Block: Best AR Pistol Upper?

Published on March 10, 2020
Duration: 18:00

This guide details the assembly and testing of the BCM 11.5'' FSB Upper Receiver Group, a duty-grade AR-15 component. It covers inspection, accessory mounting, accuracy evaluation with various ammunition, and extensive reliability testing. The review highlights the benefits of the 11.5-inch barrel for increased dwell time and consistent gas pressure, as assessed by a seasoned firearms expert from Mrgunsngear.

Quick Summary

The BCM 11.5'' FSB Upper Receiver Group provides enhanced reliability due to its 11.5-inch barrel, offering 40% more dwell time than a 10.5-inch barrel for consistent cycling. It features a durable pinned front sight block and achieved sub-MOA accuracy with match ammunition, making it a high-value, duty-grade option.

Chapters

  1. 00:31Introduction to BCM 11.5'' FSB Upper
  2. 01:19Accuracy Testing
  3. 04:30Barrel and Muzzle Specs
  4. 06:23Front Sight Block Pros and Cons
  5. 09:5711.5'' vs 10.5'' Barrel Benefits
  6. 10:56Receiver and BCG Details
  7. 13:50Reliability and Pricing

Frequently Asked Questions

What are the key benefits of the BCM 11.5'' FSB Upper Receiver Group?

The BCM 11.5'' FSB Upper offers enhanced reliability due to increased dwell time from its 11.5-inch barrel, a durable pinned front sight block for backup aiming, and proven performance with over 1,500 rounds fired without malfunctions. It's considered a high-value, duty-grade option.

How does the 11.5-inch barrel compare to a 10.5-inch barrel for reliability?

The 11.5-inch barrel provides approximately 40% more dwell time than a 10.5-inch barrel. This extended dwell time allows for more consistent gas pressure, significantly improving the cycling reliability of the firearm across various ammunition types and environmental conditions.

What kind of accuracy can be expected from the BCM 11.5'' FSB Upper?

Accuracy testing showed sub-MOA groups (7/8 inch) at 100 yards with match-grade ammunition like Gorilla 69gr Sierra MatchKing. Standard bulk ammunition like M193 yielded groups around 1.75 inches.

Is the BCM 11.5'' FSB Upper suitable for suppressed use?

Yes, the upper is compatible with suppressors. However, it's recommended to swap the standard A2 flash hider for an A1 style to ensure proper suppressor alignment and mounting, especially with suppressors like the Gemtech Halo.

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