6mm ARC 1-7.5 Twist 14.5" Stainless Steel Barrel

Name: 6mm ARC 1-7.5 Twist 14.5" Stainless Steel Barrel
Brand: Proof Research
Availability: InStock

Proof Research · Barrels

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6mm ARC 1-7.5 Twist 14.5" Stainless Steel Barrel

Best price

$579.99at GunMag Warehouse

In stock checked Nov 13, 2026

Buy at GunMag Warehouse

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Fits and works with

Caliber: 6mm ARC · Shop matching ammo
Bolt: 6.5 Grendel / 6mm ARC · Bolt carrier groups
Muzzle thread: 5/8x24 · Muzzle devices
Barrel length: 14.5" · Handguards

Specifications

Manufacturer: Proof Research
Color: Silver / Stainless
Platform: AR-15
Caliber: 6mm ARC
Barrel length: 14.5"
Twist rate: 1:7.5
Thread pattern: 5/8 x 24

Where to buy

Store	Price	Availability	Buy
GunMag Warehouse Best price	$579.99checked Nov 13, 2026	In stock	Buy at GunMag Warehouse
OpticsPlanet	$649.00Salechecked Nov 13, 2026	In stock	Buy at OpticsPlanet
MidwayUSA	$649.00checked Nov 13, 2026	In stock	Buy at MidwayUSA
Brownells 17.76% off · ends Nov 15 · exclusions apply	$649.00checked Nov 13, 2026	Out of stock	Buy at Brownells

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Lowest in-stock price in the last 30 days: $538.67 at MidwayUSA. Dashed line = out of stock. Tracking since Sep 28, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Brownells	$649.00	$649.00	$649.00
GunMag Warehouse	$579.99	$579.99	$649.99
MidwayUSA	$649.00	$538.67	$649.00
OpticsPlanet	$649.00	$649.00	$649.00

Since Sep 28, 2026.

About this part

The 6mm ARC 1-7.5 Twist 14.5" Stainless Steel Barrel is a 14.5" 6mm ARC barrel from Proof Research. It's sold by 4 stores (3 in stock), from $579.99 to $649.00. The lowest in-stock price in the last 30 days was $538.67 at MidwayUSA.

From the manufacturer

Proof Research makes their steel barrels in-house with the exact same commitment to quality and repeatability as employ on their carbon fiber barrels. The drilling, rifling, and lapping process is identical to their composite barrels. They start with the same steel as they use in the carbon fiber barrels. It is a double stress-relieved 416R stainless steel, a pre-hardened chromium stainless steel that was specifically designed by engineers in collaboration with rifle barrel makers to provide the consistent, high quality and durability the firearms industry demands. Mfg: Proof Research