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QC10 Pistolizing SOB Brace

Quarter Circle 10 SOB Pistol Stabilizing Brace

DDLES Milled AR-15 Lower Receiver

DDLES Milled AR-15 Lower Receiver Olive Drab

.40 S&W Barrels


Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. .40 S&W Barrels


As low as $59.50 was $70.00
Availability: In stock
  • 4150 CMV steel

  • 1-in-16″ twist rate

  • Choice of .578-28 or 5/8x24 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.

More Information
BARREL LENGTH 10.5 INCH, 14.5 INCH, 16 INCH, 3.5 INCH, 5.5 INCH, 7.5 INCH
Thread .578-28 , 5/8-24
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