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338 ARC Complete Upper Receivers

AR15Parts.com builds 338 ARC complete upper receivers to order for shooters who demand heavy-caliber performance in a semi-auto platform. Every upper is assembled, headspaced, and function-checked in our shop. The .338 ARC brings .338-caliber stopping power to the AR platform, optimized for both long-range precision and suppressed shooting. Heavy, high-BC .338 projectiles maintain energy at distance while offering excellent performance through a suppressor — a combination that few cartridges can match. Configure your 338 ARC upper with your choice of barrel length, handguard, muzzle device, and optional BCG and charging handle.

Why Shooters Choose AR15Parts.com for 338 ARC Uppers

Each 338 ARC upper is assembled in-house, headspaced, and inspected before shipping. Built to your exact specifications with quality components designed for the cartridge's demands. No FFL required.

How to Choose the Right 338 ARC Upper

Barrel Length & Gas System

338 ARC uppers are available in 16", 18", and 20" barrel lengths with mid-length or rifle-length gas systems. Longer barrels maximize velocity for the heavy .338-caliber projectiles. A 1:8 twist rate stabilizes heavy match and hunting bullets for consistent performance at range.

Complete Upper vs. Barreled Upper

Complete uppers include BCG and charging handle. Barreled uppers come assembled without them. The 338 ARC uses a dedicated bolt, so we recommend a complete upper for your first build in this caliber.

Key Specifications

Muzzle Velocity: \~2,400 fps with 200gr bullets Effective Range: 600+ yards Barrel Twist: 1:8 Recoil: Moderate Bolt: Dedicated 338 ARC bolt

338 ARC Upper Compatibility

The 338 ARC requires a dedicated 338 ARC bolt and specific 338 ARC magazines. The upper mounts on a standard AR lower receiver. Suppressor compatibility is a core strength — the cartridge was designed with suppressed use in mind, and .338-caliber suppressors deliver excellent sound reduction.

Best Uses for 338 ARC Uppers

The 338 ARC excels in two primary roles: long-range precision shooting and suppressed applications. Heavy .338-caliber projectiles maintain energy at extended ranges where lighter bullets lose effectiveness. For hunters, the 338 ARC offers medium to large game capability with superior suppressed performance compared to most other AR calibers.

Frequently Asked Questions

What is included in a complete 338 ARC upper?

Complete uppers include the upper receiver, barrel, gas block, gas tube, handguard, and muzzle device — assembled and headspaced. BCG and charging handle available as add-ons.

Do I need an FFL for a 338 ARC upper?

No. Upper receivers are not firearms and ship directly to your door.

Will a 338 ARC upper fit my lower?

Our 338 ARC uppers fit on a standard AR lower receiver. Verify compatibility with your specific lower before ordering.

What BCG does the 338 ARC use?

The 338 ARC requires a dedicated 338 ARC bolt in a standard AR carrier.

Can I suppress a 338 ARC upper?

Yes. The 338 ARC was designed with suppressed shooting in mind. A .338-caliber suppressor delivers excellent sound reduction.

What is the effective range of 338 ARC?

The 338 ARC is effective to 600+ yards, with heavy bullets maintaining energy well at extended distances.

How long does shipping take?

Most in-stock configurations ship within 3-5 business days. Custom builds may take 2-3 weeks. Orders over $99 ship free.

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