What AR Uppers should I choose?

Published on June 19, 2023
Duration: 27:00

This video explores AR-15 upper receiver choices, emphasizing practicality and evolving technology. Hosts Eric and Roy discuss their preferred setups, including a 10.3-inch MK18 for CQB and 13.7/13.9-inch uppers for longer ranges, highlighting how modern suppressors have improved short-barreled rifle performance. They also identify the 12.5-inch mid-length as an ideal 'do-all' option.

Quick Summary

The ideal 'do-all' AR-15 upper features a 12.5-inch barrel with a mid-length gas system. This configuration balances maneuverability for close engagements with adequate velocity for longer distances, making it a versatile choice.

Chapters

  1. 00:43Intro: AR Upper Philosophy
  2. 02:34Short Upper: 10.3" MK18 & Suppressors
  3. 05:18Eric's 10.3" MK18 Build Details
  4. 11:12Roy's Long Upper: 13.7" Centurion
  5. 14:06Eric's Long Upper: 13.9" KAC
  6. 16:23The 'Do-All' Choice: 12.5" Mid-Length

Frequently Asked Questions

What is the best barrel length for a versatile AR-15 'do-all' rifle?

The consensus for a versatile 'do-all' AR-15 upper is a 12.5-inch barrel with a mid-length gas system. This length provides a good balance between maneuverability for close-quarters and sufficient velocity for standard ball ammunition at longer ranges.

How have modern suppressors changed short-barreled AR-15 upper recommendations?

Modern flow-through suppressors have significantly improved short-barreled AR-15 uppers (like the 10.3-inch MK18) by reducing gas blowback and improving the shooting experience, making them more viable and pleasant, especially for left-handed shooters.

What are the benefits of a 13.7-inch or 13.9-inch AR-15 upper?

Barrels in the 13.7 to 13.9-inch range, especially with a heavier profile, offer a better-balanced rifle compared to longer barrels. This configuration helps keep the rifle's mass centered, improving handling and perceived weight.

Should rail rigidity be prioritized over weight savings on an AR-15 build?

Yes, especially for builds intended for night vision use. Prioritizing rail rigidity ensures that sensitive IR aiming devices maintain their zero under recoil and environmental stress, which is crucial for effective operation.

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