Quarter Circle 10 .40 S&W caliber 7.5 inch barrel.

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Quarter Circle 10 .40 S&W caliber 7.5 inch barrel. 2
  • 4150 CMV steel

  • 1-in-16″ twist rate 

  • .578-28 Threading

  • QPQ Nitride treated

  • .75″ (medium) profile


QC10 .40 S&W barrels are threaded for the attachment of flash hiders, suppressors,* and accessories, and finished with a nearly indestructible protective treatment. Our barrels have a medium outer profile and come in a variety of lengths to suit any need.


Note: Barrels are measured from the end of the muzzle to the end of the breech/feed ramp. Approximately 1″ of the barrel rests inside the upper receiver upon installation, resulting in an installed length of 1″ less than listed overall length.

*The installation of a pistol-caliber suppressor requires the use of a fixed barrel spacer. See your suppressor manufacturer for information on the requirements of your particular model.