AR-40 .40 S&W 4" Barrel, 1:16 Twist, 4150 CMV, 5/8x24 Thread, Black Nitride Finish, Made in USA

AR-40 4" Barrel: Specs

Engineered for compact AR pistol builds, this AR-40 .40 S&W 4" barrel is made from 4150 Chrome Moly Vanadium steel, heat treated and stress relieved for long-lasting durability and accuracy. Finished in black nitride, this barrel offers corrosion resistance and smooth bore performance ideal for high round counts.

Perfectly suited for AR-40 S&W pistol configurations, the 1:16 twist rate stabilizes a wide range of .40 S&W bullets while the 5/8x24 thread pitch allows for suppressor or muzzle brake attachment.

Barrel Specifications:

• Caliber: .40 S&W

• Length: 4"

• Twist Rate: 1:16

• Thread Pitch: 5/8x24

• Material: 4150 gun quality Chrome Moly Vanadium steel

• Finish: Black Nitride

• Treatment: Heat treated and stress relieved

• Platform Fit: AR-40 S&W pistols

• Country of Origin: USA

FAQ

Is this barrel for blowback?

Yes. It is a pistol-caliber blowback barrel, so no gas block or gas tube is used.

What twist rate does it use?

1:16, the common twist for heavy pistol-caliber bullets.

What muzzle thread does it have?

5/8x24.

Related: AR-40 barrels · pistol caliber carbines

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