HOW WE SETUP OUR 13.9" AR15 RIFLES!!!

Published on July 31, 2023
Duration: 41:50

This video details the build process for 13.9-inch AR-15 General Purpose Rifles (GPRs), focusing on component selection for versatility. Key recommendations include using 13.9-inch barrels, optics with magnification for extended range, durable bolt carrier groups for suppressed fire, and quality triggers and slings for reliability and control. The presenters emphasize choosing components based on individual needs and environments.

Quick Summary

A 13.9-inch barrel is ideal for an AR-15 General Purpose Rifle (GPR), offering a balance of maneuverability and effective range. For enhanced target acquisition beyond 300 yards, optics with magnification like 5x prism scopes are recommended over red dots alone. A durable, PVD-coated bolt carrier group is crucial for reliability when shooting suppressed.

Chapters

  1. 01:18What is a GPR Rifle?
  2. 02:46Suppressor & Muzzle Device Setup
  3. 06:30Iron Sights vs. Optics
  4. 09:02Weapon Light Recommendations
  5. 11:17Foregrips & Handstops
  6. 11:49Rail System Selection
  7. 13:54Upper & Lower Receiver Choices
  8. 16:19Attachments on the Rail
  9. 18:00Bipod Considerations
  10. 19:03Optic Selection for GPR
  11. 24:48Trigger Choices
  12. 27:34Lower Parts Kit & BCG
  13. 32:01Sling Importance & Types
  14. 34:24Stock Selection
  15. 36:54Barrel & Gas System
  16. 38:29GPR Philosophy & Environment

Frequently Asked Questions

What barrel length is recommended for a General Purpose Rifle (GPR) build?

A 13.9-inch barrel is recommended for a General Purpose Rifle (GPR) build. This length offers a good balance between maneuverability and effective range, especially when paired with a suppressor, allowing it to reach legal SBR lengths without requiring an NFA tax stamp.

What type of optic is best for a 13.9" AR-15 GPR?

For a 13.9-inch AR-15 GPR, an optic with magnification, such as a 5x prism scope, is highly recommended. This allows for better target identification and engagement at distances beyond 300 yards, which is crucial for a general-purpose rifle.

Why is a durable bolt carrier group important for suppressed AR-15 builds?

A durable bolt carrier group (BCG) with a PVD coating (like Titanium Nitride or Nickel Boron) is essential for suppressed AR-15 builds because it resists carbon buildup, leading to more reliable function and easier cleaning compared to standard phosphate coatings.

What are the advantages of Midwest Industries Combat Rails for AR-15 builds?

Midwest Industries Combat Rails are praised for their affordability, rigidity, and secure lock-up to the upper receiver. They also feature anti-rotation tabs, making them a cost-effective and reliable choice for builders seeking a solid foundation for their AR-15.

Should I use iron sights on my 13.9" AR-15 GPR?

While iron sights can serve as a backup, it's recommended that if you use them, your primary optic should be QD (Quick Detach) or have a throw lever. This allows for rapid removal of a damaged or malfunctioning optic to utilize the iron sights effectively.

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