.338 ARC Rifle Build

Published on October 1, 2025
Duration: 29:37

This video provides a detailed, step-by-step guide to building an AR-15 chambered in the .338 ARC caliber. The build features components like a Faxon barrel, Midwest Industries handguard, Dead Air suppressor, and a Rifle Speed adjustable gas block. The instructor emphasizes proper torque specifications and installation techniques for critical components, offering insights into the .338 ARC cartridge's advantages for hunting and its subsonic capabilities.

Quick Summary

The .338 ARC cartridge offers harder-hitting subsonic performance compared to .300 Blackout due to its heavier .338 projectile, making it a potent option for hunting applications like taking down hogs. Duramag 400 Legend magazines are currently recommended for reliable feeding.

Frequently Asked Questions

What are the advantages of the .338 ARC cartridge over .300 Blackout?

The .338 ARC cartridge offers harder-hitting subsonic performance compared to .300 Blackout. This is primarily due to its use of a heavier .338 projectile, making it a more potent option for hunting applications like taking down hogs.

How do you properly install an adjustable gas block like the Rifle Speed model?

When installing a Rifle Speed adjustable gas block, ensure the gas tube is correctly seated and secured with its roll pin. The gas block itself is then attached to the barrel using set screws, which often have serrated teeth to bite into the barrel for a secure fit.

What magazines are recommended for the .338 ARC caliber?

At the time of this video, Duramag 400 Legend magazines are recommended for reliable feeding of .338 ARC ammunition. While .338 ARC-specific magazines may become available, the 400 Legend magazines offer proven performance.

What is the correct procedure for mounting an optic on an AR-15 rail?

To properly mount an optic, push the optic mount as far forward into the Picatinny rail as possible before tightening the clamping mechanism. This ensures the optic stays in place under recoil, preventing it from shifting forward.

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